The story
- Old English · inherited fromĊildamæsse dæg
- Middle English · inherited fromChildermasse day
- English todayChildermas
From Childermas-Day, from Middle English Childermasse day, from Old English Ċildamæsse dæg, from ċilda (“children's”) + mæsse (“mass, religious service”) + dæġ (“day”), equivalent to childer + -mas.
Etymology from Wiktionary, CC BY-SA 4.0.