köken: From Middle Persian [script needed] (hāmīn), from Old Persian, from Proto-Iranian, from Proto-Indo-Iranian (compare Sanskrit समा (sámā, “season, year”)), from Proto-Indo-European *s(e)m-eh₂- (compare English summer).
köken: From Byzantine Greek καλοκαίριν (kalokaírin, “good season, good weather”), from Ancient Greek καλοκαίριον (kalokaírion, “fine weather”). By surface analysis, καλός (kalós) + καιρός (kairós).
köken: Etymology tree Proto-Indo-European *gʷʰer- Proto-Indo-European *-mós Proto-Indo-Iranian *gʰarmás Proto-Iranian *garmáhder. Middle Persian 𐭢𐭥𐭬𐭩𐭧 (gʿmyḥ /garmīh/) Classical Persian گَرْمِی (garmī)bor. Hindi गर्मी Borrowed from Classical Persian گَرْمِی (garmī), from Middle Persian 𐭢𐭥𐭬𐭩𐭧 (gʿmyḥ /garmīh/), from Proto-Iranian *garmáh, from Proto-Indo-Iranian *gʰarmás, from Proto-Indo-European…
köken: From Proto-Finnic *kesä (compare Estonian kesa (“fallow”), Veps keza (“summer”), Võro kesä (“fallow”)), from Proto-Finno-Permic *kesä (“summer”) (compare Northern Sami geassi, Erzya кизэ (kizë)), possibly a loanword from Indo-European; see it for more. Introduced from the eastern dialects into the standard language in the 19th century to replace the Western Finnish word suvi.
From Middle High German sumer, from Old High German sumar, from Proto-West Germanic *sumar. The expected modern form is Summer, as indeed found in most southern dialects, such as Alemannic German Summer, Bavarian Summer and Luxembourgish Summer. The vocalism -o- is of Central and Low German origin (compare Middle Low German som[m]er). Further cognates are Dutch zomer, West Frisian simmer, English…