Where does “bird-” come from?

bird- (Proto-Balto-Slavic) comes from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “bird-”, step by step

StepLanguageWordMeaning
1Hungarian-dyour; Used in the second-person singular definite...
2Middle Welsh-nt3rd person plural verb ending

Words derived from “bird-”

Every word from Middle Welsh -nt →Every word from Hungarian -d →