Where does “do-” come from?

do- (English) comes from English dodeca-, from Ancient Greek δώδεκα, from Proto-Indo-European *dwoΗdeḱm̥.

Ancestry of “do-”, step by step

StepLanguageWordMeaning
1Englishdodeca-API; twelve
2Ancient Greekδώδεκαtwelve
3Proto-Indo-European*dwoΗdeḱm̥—

Words derived from “do-”

Every word from Proto-Indo-European *dwoΗdeḱm̥ →Every word from English dodeca- →Every word from Ancient Greek δώδεκα →