Middle Welsh amser

← Proto-Celtic *amsterā (inherited)

← Proto-Indo-European (derived)

← Proto-Indo-European *h₂meh₁- (mention)

← Old Welsh amser (inherited)

← Old Irish aimser (cognate)

→ Welsh amser (inherited)

→ Middle Irish aimser (cognate)

→ Old Irish aimser (cognate)

→ Middle Welsh amserach (suffix)