What Is Thursday Named After? | Thor And Jupiter Links

Thursday sits in the middle of many people’s week, so its name gets said a lot. Still, plenty of readers pause and ask, “Why that word?” If you’ve ever typed what is thursday named after? into a search bar, you’re not alone.

Here’s the deal: English kept a set of weekday names shaped by early Germanic speech, then polished by later spelling habits. Thursday’s label points to a thunder god, and the trail runs through Old English and Old Norse forms that mean “Thor’s day.”

Weekday Name Matches By Language

The same day carries different labels across Europe. Some languages map the day to Thor or a related Germanic figure. Others keep the Roman god Jupiter (also called Jove). The table below puts those pairings side by side.

Language	Thursday Name	Named After
English	Thursday	Thor / Thunor
Norwegian	Torsdag	Thor
Danish	Torsdag	Thor
Swedish	Torsdag	Thor
Icelandic	Fimmtudagur	Numbered weekday
German	Donnerstag	Donar / thunder
Dutch	Donderdag	Donar / thunder
French	Jeudi	Jupiter
Spanish	Jueves	Jupiter
Italian	Giovedì	Jupiter
Portuguese	Quinta-feira	Numbered weekday

What Is Thursday Named After? The Straight Origin

In English, Thursday traces back to an Old English form often written as Þunresdæg, meaning “day of Þunor.” Þunor is the Old English name tied to Thor, the hammer-bearing thunder god found across Germanic tradition. Over time, pronunciation and spelling drifted into the Thursday you see now.

Old Norse also mattered. Norse-speaking settlers and traders moved through parts of Britain, and their word Þórsdagr (“Thor’s day”) sat close to the Old English label. When two near-matching terms meet in daily speech, they can tug spellings toward one another. That’s one reason early records show a mix of forms.

What Thursday Is Named After In Old English And Norse Sources

If you like the nuts and bolts, it helps to split the word into parts. The last piece is easy: day comes from an old Germanic word for a day. The first piece is the god name, written with spellings that shift by place and century. Put together, the sense stays steady: this weekday belongs to Thor.

That raises a fair question: why did Germanic speech tie a weekday to a god at all? The short reason is that the seven-day week spread with Roman practice. Germanic speakers kept the pattern but swapped the names into their own myth set.

How Thor Got Picked For This Day

Romans linked the day to Jupiter, ruler of sky and thunder. Germanic speakers matched Jupiter with their own thunder figure. In many areas that match was Thor, while in other areas it was Donar or a related name. You can still see that older match in German and Dutch forms that point to thunder.

If you want a clean refresher on the Roman side, a quick read of NASA’s Jupiter page puts the planet and its name in one place. The weekday tie comes from an older habit of linking days to gods and planets, with Jupiter placed on Thursday in that scheme.

On the Germanic side, Thor’s profile fits the slot well: he’s tied to thunder, storms, strength, and protection in myth. Encyclopaedia Britannica’s entry on Thor in Germanic tradition gives a clear outline of who he is and why he mattered to early Northern peoples.

Thor, Thunor, And Donar Are The Same Role

Thor is the name most English speakers know, yet older Germanic speech used several names for the same thunder figure. Old English tends to show Þunor. Old High German shows Donar. Old Norse shows Þórr. The spellings look different, but the role stays close: a thunder god with strength, storms, and a protective streak.

This is why German Donnerstag feels like “thunder day.” It’s tied to Donar, and the modern German word for thunder (Donner) sits right beside it. Dutch has a similar story with donder. English took the deity name route and kept it in a softer, less transparent spelling.

Why Romance Languages Sound Nothing Like Thursday

English is part of the Germanic language family, so its weekday names share roots with German, Dutch, and the Scandinavian set. French, Spanish, and Italian come from Latin, so they kept more Roman labeling.

That’s why French has jeudi, Spanish has jueves, and Italian has giovedì. Each runs back to a Latin phrase tied to Jupiter. When you hear those words, you’re hearing Jupiter’s stamp, not Thor’s.

Portuguese stands out with a numbered weekday term (quinta-feira). That naming style grew from church Latin that counted days relative to Sunday, so it sidestepped god names on the calendar.

How Planet Names Got Tied To Weekdays

The seven-day week is older than English, and the name set did not start as random labels. A long-running idea paired each day with a visible “wanderer” in the sky: Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn. That same set underlies the planet symbols you still see in old almanacs.

Once Jupiter became “the Thursday planet” in that pattern, the Roman god name slid into place too. When Germanic speakers copied the week, they copied the order and swapped the god names, not the day order. That swap is why the day stays in the same spot even when the label changes.

Spelling Shifts That Turned Þunresdæg Into Thursday

Old English used letters that modern English dropped, like thorn (Þ), which marked a “th” sound. As scribes moved toward newer spelling habits, that letter faded and got replaced by “th.”

The middle of the word shifted too. Early forms could keep an “n” sound (as in Thunres-), yet later English often lost it. Norse influence and sound change both help explain why many later spellings slide toward Thurs-.

Vowels moved around as well. Middle English spelling often reflects local speech, and writers did not have a single rulebook. When printing and schooling later pushed spelling into a tighter lane, Thursday had settled into its modern shape.

Common Myths About Thursday’s Name

Myth: Thursday is named after the planet Jupiter only. In English, the deity-name route is Thor, even if the older Roman pairing used Jupiter for the same weekday slot.

Myth: Thursday is named after thunder as a plain word. German and Dutch names lean closer to a thunder word, yet English points to the deity name first.

Myth: The name came from modern pop stories. The roots are far older than comics or films, and they show up in early medieval spellings.

Quick Ways To Spot The Origin In Daily Use

Once you know the link, you’ll notice it in small places:

• Scandinavian torsdag forms keep Thor in plain sight.
• German Donnerstag and Dutch donderdag keep a thunder-linked root.
• French jeudi and Spanish jueves carry a Jupiter trace.

That mix can help with language learning. When a new word feels random, a name map gives it a hook you can recall later.

How The Seven-Day Week Became Standard

Thursday’s naming only makes sense inside the seven-day week. That week spread across the Roman Empire and beyond. As it traveled, local languages translated the weekday set into terms that fit their own speech habits.

English, like other Germanic tongues, did not copy Latin labels word for word. It borrowed the week structure, then swapped deity names. That swap is why you get Thursday, Wednesday, and Friday instead of direct Latin day names.

If you teach this topic, a simple classroom move is to write the Latin-based names on one side and the Germanic-based names on the other. Then draw a line between Jupiter and Thor, between Mercury and Odin/Woden, between Venus and Frigg or Freyja depending on the tradition you’re using. Students see the pattern in one glance.

How To Use This In Writing Without Tripping Over Details

When you write about history, language, or myth, weekday names can become a small snag. A few habits keep your wording clean.

Use Thor For English Etymology

When the question is what is thursday named after? in English, answer with Thor (or the Old English form Þunor) and mention the Roman match only as background.

Use Jupiter For Romance Forms

When you’re explaining jeudi, jueves, or giovedì, tie them to Jupiter. That keeps the story tidy and matches how those words formed.

Watch For False Friends In Translation

German Donnerstag looks like it’s “thunder day,” and in a sense it is, but it still sits in the same weekday slot and fits the same thunder-god pairing idea.

Table Of Older Spellings And What They Show

Early texts did not follow one fixed spelling rule, so you’ll see a range of forms. The list below shows how the core pieces stayed in place even while letters moved around.

Form	Rough Period	What It Points To
Þunresdæg	Old English	Day of Þunor
Thunresdæg	Old English	Day of Þunor
Thurresday	Middle English	Thor link stays
Thuresday	Middle English	Thor link stays
Thorsday	Early Modern	Norse pull shows
Thursday	Modern English	Stable spelling

Thursday On Calendars And In Short Form

Once you know where the name comes from, you can spot it in the small shorthand people use. Most English calendars shorten the day to Thu or Thurs. In class notes, you may see Th, yet that can clash with Tue and Thu if the writer is rushing.

If clarity matters, stick with Thu or Thurs, then keep the same choice across the page. When you’re writing for an audience that reads multiple languages, it can help to add the local form in parentheses once, then return to the main language for the rest of the piece.

A Quick Timeline For The Name

• Latin calendars used a Jupiter label for the day in the seven-day set.
• Germanic speech copied the week order and swapped in its own thunder god name.
• Old English texts show forms like Þunresdæg, pointing to Þunor.
• Later English spelling dropped thorn (Þ) and settled on Thursday.

This is why the answer stays steady even when you meet new spellings. The parts that matter are the same: a day name plus the thunder god name, carried forward by habit.

A One-Page Recap You Can Share

Thursday’s English name comes from “Thor’s day,” shaped by Old English and Old Norse forms. Other languages keep Jupiter’s label for the same weekday slot, while some use numbered names. If someone asks that exact weekday naming question, Thor is the direct answer in English.

Next time you see Thursday written in another tongue, check the god behind it. Thor and Jupiter share the slot, so the name shift is a translation, not a mystery anymore.