English form, used in the Authorized Version of the Bible (alongside the Latin form Timotheus), of the Greek name Timotheos, from timē ‘honour’ + theos ‘god’. This was the name of a companion of St Paul; according to tradition, he was stoned to death for denouncing the worship of Diana. It was not used in England before the Reformation but has been in steady use since the 18th century.
Irish: Anglicized form of Gaelic Mac Giolla Dhé ‘son of the servant of God’, from Dia ‘God’. The name originated with a monastic family in Donegal in the 11th century and has always been more or less confined to northwestern Ireland, where it is usually written Kildea.