köken: Inherited from Latin diēs Mercurī, with ellipsis of "day", dissimilation of R-L and the ending analogically reshaped after most other days of the week.
Wednesday (now generally considered the third day of the week in non-religious contexts in Sweden)
çekim: çoğul onsdagar · tamlayan onsdags
köken: The word is originally a short form for Odens dag, meaning day of Oden. (Note: "Oden" and "Odin" are alternative spellings of the same name.) From Old Swedish oþinsdagher, from Old Norse óðinsdagr (“Odin's day”), from Proto-West Germanic *Wōdanas dag.
köken: Etymology tree Proto-Indo-European *ḱerd- Proto-Balto-Slavic *śerd- Proto-Slavic *serdà Old Polish śrzoda Polish środa Inherited from Old Polish śrzoda.
Wednesday (day of the week; the third day of the week in Finland and in the ISO 8601 standard)
çekim: çoğul keskiviikot · tamlayan keskiviikon
köken: keski- (“mid-, middle”) + viikko (“week”), a calque either of Middle Low German middewēke (compare modern German Mittwoch), or of a seemingly unattested Old Swedish word (compare Old Norse miðvikudagr (literally “mid-week day”)). Note that Wednesday was the middle of the seven-day week when Sunday was still the first day of the week in Finland prior to 1973.
köken: Borrowed from Proto-Slavic *serdà (“middle”, from the idea of "middle of the week"). Compare Serbo-Croatian sreda, Slovene sreda, Bulgarian сря́да (srjáda). Cognate with English heart.
From Middle High German mittewoche, from Old High German mittawehha (literally “middle of the week”), calqued on Ecclesiastical Latin media hebdomas (whence Dalmatian misedma). Equivalent to Mitte (“mid, middle”) + Woche (“week”), becoming a masculine in Early Modern German after the other weekdays. Compare Middle Low German middewēke, English midweek. Originally meaning the middle between Sunday…