Lord Reay is a title in the Scottish peerage first conferred on Sir Donald Mackay of Far, the elder son of Hugh Mackay in 1628. From a village in NW Caithness (11 ml WSW of Thurso) which was once a burgh of regality and granted to Sir Donald Mackay when he was knighted in 1616. This sept of the Mackays are probably descended from William, son of Donald Mackay.
The name Reside has been altered over time. It began from the Reay, and became Reayside, then Reaside (for a considerable amount of time) then Reside