Old Irish at·tá

→ Welsh taw (cognate)

→ Irish bí (derived)

→ Irish atá (inherited)

→ Scottish Gaelic bi (mention)

→ Scottish Gaelic tha (derived)

→ Manx ta (inherited)

→ Middle Irish attá (inherited)

→ Old Irish bí (mention)

→ Old Irish doesta (mention)

→ Old Irish cetabí (mention)

→ Old Irish dofil (mention)