Hampson (Hempson, O'Hampson, O'hAmhsaigh, O'Hampsey) is a surname. The small clan of O’hAmhsaigh (O’Hampsey) had become O'Hamson by 1659, when it is recorded in the census of 1659 as one of the principal Irish surnames in the barony of Keenaght, and as O'Hampson and Hampson it is found in the contemporary Hearth Money Rolls for County Londonderry.