Kissack contracted from MacIssaac- Isaac's Son- - is rarely found except in the Isle of Man.
GILBERT MCISSAK was one of the 24"keys of Mann" .in 1417, In 1422 HAWLEY M'CISSACKE "was arraingedfor that he feloniously rose upon John Walton Lieutenant of MANN sitting in the Court of Kirk Michaell"
Compare (Gaelic) McIsaac,McKissack: (English) Isaacs,Isaacson. McIssak (1417). MaIIssacke, McKissag (1422), MacKissage (1429), M'Isacke, (1430), M'Isaack((1504), KIssage (1586), Kissak(1599), Kyssagge(1601, Kissag, KIssaige (1610), Kysaige(1629). ( Surnames and Placenames of the Isle of Man Moore 1890)