West Frisian do

← West Frisian dû (alter)

← Proto-Germanic *þū (inherited)

← Proto-Germanic *dūbǭ (inherited)

← Proto-West Germanic *þū (inherited)

← Proto-Indo-European *túh₂ (inherited)

← Italian do (borrowed)

← Old Frisian thū (inherited)

← Old Frisian *dūve (inherited)

→ English thou (cognate)

→ English dove (cognate)

→ Luxembourgish Dauf (cognate)

→ German Low German Duuv (cognate)