Old Irish for-

← Proto-Celtic *uɸor- (inherited)

← Old Irish for (mention)

→ Irish foirgneamh (derived)

→ Old Irish fording (affix)

→ Old Irish doformaig (affix)

→ Old Irish forbeir (affix)

→ Old Irish forben (affix)

→ Old Irish forcain (affix)

→ Old Irish forcenn (affix)

→ Old Irish forfen (affix)

→ Old Irish fortacht (affix)

→ Old Irish forcell (affix)

→ Old Irish foraithminedar (affix)

→ Old Irish fortét (affix)

→ Old Irish forcumaing (affix)

→ Old Irish fortá (affix)