Old Irish ísel

← Proto-Celtic *ɸīsselos (inherited)

← Proto-Celtic *ɸīssu (mention)

← Welsh isel (cognate)

← Proto-Indo-European *ped- (root)

← Proto-Indo-European (derived)

← Proto-Indo-European *pṓds (mention)

→ Welsh isel (cognate)

→ Irish íseal (inherited)

→ Irish ísle (mention)

→ Old Irish ísle (affix)