Old Irish fo

← Proto-Celtic *uɸo (inherited)

← Proto-Indo-European *upo (inherited)

→ Welsh go- (cognate)

→ Irish fé (inherited)

→ Irish faoi (inherited)

→ Irish fothair (mention)

→ Irish faoi deara (mention)

→ Scottish Gaelic fo (inherited)

→ Scottish Gaelic fo- (derived)

→ Manx fo (inherited)

→ Manx fo- (derived)

→ Old Irish fo- (mention)

→ Old Irish foithir (mention)

→ Old Irish fogleinn (prefix)

→ Old Irish foálgi (prefix)