Old Irish sen

← Proto-Celtic *senos (inherited)

← Proto-Indo-European *sénos (inherited)

→ Irish sine (mention)

→ Irish sean (inherited)

→ Scottish Gaelic sean (inherited)

→ Scottish Gaelic seanmhair (mention)

→ Manx shenn (inherited)

→ Latvian sens (cognate)

→ Old Irish senathair (compound)

→ Old Irish senmáthair (compound)