köken: Related to Chuvash утлан (utlan, “to ride a horse”), also dialectal Bashkir and Tatar атланган күн (atlangan kün, “Tuesday; lit. horse riding day”), Eastern Mari кушкыжмо (kuškyžmo, “Tuesday; lit. horse riding day”). Perhaps from Volga Bulgar *اطلنروى كوان (atlanruwi küwen).
köken: From Hellenistic Koine Greek Τρίτη (Trítē) from τρίτος (trítos, “third”) with ellipsis of the feminine noun ἡμέρα (hēméra, “day”): "the third day after Saturday".
Tuesday (now generally considered the second day of the week in non-religious contexts in Sweden)
çekim: çoğul tisdagar · tamlayan tisdags
köken: From Old Swedish tisdagher, from an East Norse variant *tísdagr of Old Norse týsdagr, from Proto-West Germanic *Tīwas dag (the rounding of the *-ī- to -ý- due to the following *-w- is a West Norse development), a calque of Latin dies Martis.
köken: From két (“two”, probably referring to the second day after Sunday) + -ed (ordinal-forming suffix, currently -edik), with elision. Compare ketted (“half”, less common, more technical synonym of fél) and második (“second”).