Old Irish rí

← Proto-Celtic *rīxs (inherited)

← Proto-Indo-European *h₃rḗǵs (inherited)

← Proto-Indo-European *h₃reǵ- (mention)

← Latin rēx (cognate)

← Sanskrit राज् (cognate)

← Sanskrit राजन् (mention)

→ Irish rí (inherited)

→ Irish uirrí (mention)

→ Scottish Gaelic rìgh (inherited)

→ Manx ree (inherited)

→ Latin rex (cognate)

→ Middle Irish rí (inherited)

→ Middle Irish rígad (link)

→ Old Irish ríge (mention)

→ Old Irish rígdae (suffix)

→ Old Irish ruiri (mention)

→ Old Irish Fíachrai (affix)