Old Irish -óc

← Proto-Brythonic *-ọg (borrowed)

← Proto-Celtic *-ākos (derived)

← Old Irish -ach (doublet)

→ Irish ialtóg (mention)

→ Irish -óg (inherited)

→ Irish fuinseog (mention)

→ Irish seamróg (mention)

→ Scottish Gaelic -ag (inherited)

→ Scottish Gaelic ialtag (mention)

→ Manx -ag (inherited)

→ Manx fedjag (mention)

→ Old Irish -ach (doublet)

→ Old Irish -acán (suffix)