The story
- Proto-Germanic · inherited from*midjasumaraz“midsummer”
- Proto-West Germanic · inherited from*midisumar
- Old English · inherited frommidsumer
- Middle English · inherited frommidsomer
- English todaymidsummer
From Middle English midsomer, midsumer, from Old English midsumer, midsumor (“midsummer”), from Proto-West Germanic *midisumar, from Proto-Germanic *midjasumaraz (“midsummer”), equivalent to mid- + summer. Cognate with West Frisian midsimmer (“midsummer”), Dutch midzomer (“midsummer”), German Mittsommer (“midsummer”), Danish midsommer (“midsummer”), Swedish midsommar (“midsummer”), Icelandic miðsumar (“midsummer”).
Etymology from Wiktionary, CC BY-SA 4.0.