Hi there, I have got Tait's in my family, the earliest being my GGGG grandfather John Tait who was born c1760 in Ireland, he married Janet Boyce also from Ireland. They had 3 sons Samuel b1781 in Girvan, Ayrshire, Robert b 1787 in Girvan and John b 1795 in Ireland. All 3 sons had daughters called Mary. Samuel's daughter Mary was born 1812 in Girvan. Robert's Mary b1816 in Girvan and John's Mary b1832 in Girvan. Let me know if this is of any help