Basically, I think it's just a form of
Gordon.
Found this at
http://shop.store.yahoo.com/4crests/surmeaneh.html:
Gordon is a Scottish place name, from a so-named location in the former county Berwickshire (now part of Borders region) and named for Breton words that preceded Welsh gor = spacious + din = fort. Occasionally, it is an English place name from Gourdon in Saone-et-Loire, from the
Roman given name Gordus, or among the Irish as an Anglicized form of the Gaelic Mag Mhuirneachain (son of beloved). When of French origin, it is a nickname for the heavy man, from Old French gort = fat. Those of Jewish heritage with the name likely derived it as a place name from the Belorussian city of Grodno. Gourdon, Gurdon are variations of all but the Jewish form. Two variations of the Irish name are McGournaghan, McGournasan . French variants are Gordet, Gordin . Jewish versions include Gordin, Gordonoff, Gordonowitz .