Lindsay
Lindsay—This name is the anglicised form of about three sept names. First, it has been assumed by some of the Co. Down sept Linchy (O'Loingsigh), secondly by a McDonald sept, Mac Loingsigh, in Argyle, and thirdly by M'Clintock (Mac Giolla-Fhiontóg), and also said to be assumed along with Lynd, the anglicised form of O'Floinn in Antrim. See Lynd.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees