Where does “Twelvetide” come from?

Twelvetide (English) comes from English tide, from Middle English tyde, from Old English tīd, from Proto-Germanic tīdiz, from Proto-Indo-European déh₂itis, from Proto-Indo-European deh₂y-, from Proto-Indo-European deh₂- — to share, divide.

Ancestry of “Twelvetide”, step by step

Twelvetide traces back through two separate lines of ancestry.

via English tide

StepLanguageWordMeaning
1EnglishtideThe periodic change of the sea level,...
2Middle EnglishtydeA time (period), season
3Old Englishtīdtime, period, season; period, season, time;...
4Proto-Germanictīdiztime; period, interval
5Proto-Indo-Europeandéh₂itisinterval, period of time
6Proto-Indo-Europeandeh₂y-to share, divide
7Proto-Indo-Europeandeh₂-to share, divide

via English twelve

StepLanguageWordMeaning
1EnglishtwelveThe cardinal number occurring after eleven and...
2Middle Englishtwelvetwelve
3Old Englishtwelftwelve
4Proto-Germanictwaliftwelve
5Proto-Germanic-lifleft over
6Proto-Indo-Europeanleyp-to stick; fat or sticky substance
7Proto-Indo-Europeanlēy-to leave, let; to want, desire; to let; leave...
Every word from Proto-Indo-European deh₂-