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Irish do
← Breton da (cognate)
← Proto-Celtic *ɸro- (inherited)
← Proto-Celtic *do (inherited)
← Proto-Celtic *tou- (inherited)
← Welsh dy (cognate)
← Irish d’ (alter)
← Irish (alter)
← Irish used before vowels and lenited fh- (alter)
← Irish go (mention)
← Irish a (mention)
← Irish d’ (alter)
← Irish (alter)
← Irish used before vowel sounds (alter)
← Irish go (mention)
← Irish d’ (alter)
← Irish (alter)
← Irish used before vowel sounds (alter)
← Irish t’ (alter)
← Irish (alter)
← Irish Munster (alter)
← Irish used before vowel sounds (alter)
← Cornish dha (cognate)
← Middle Irish ro- (inherited)
← Old Irish ro- (inherited)
← Old Irish do (inherited)
← Old Irish do (inherited)

→ English to (mention)
→ Breton da (cognate)
→ Welsh i (cognate)
→ Welsh dy (cognate)
→ Irish is (mention)
→ Irish dar (mention)
→ Irish an (mention)
→ Irish ar (mention)
→ Irish d' (mention)
→ Irish d' (mention)
→ Irish a (mention)
→ Irish beir (mention)
→ Irish fuath (mention)
→ Irish sna (mention)
→ Irish daoibh (compound)
→ Irish beannaigh (link)
→ Irish adhair (link)
→ Irish fód (mention)
→ Irish géill (mention)
→ Irish fabhraigh (mention)
→ Irish trua (mention)
→ Irish aithin (link)
→ Irish cuimhnigh (mention)
→ Scottish Gaelic do (cognate)
→ Scottish Gaelic do (cognate)