hey Cheryl, welcome to the board!!!
funny, when i think of the word "gilgo", i first think of "gilgo beach" out on long island (ny --> u.s.a.), not far from where i used to live (http://www.bungersurf.com/Bunger_Surfcam/)

i found
http://www.last-names.net. put in "gilgo" and search. you can try it free for 14 days.
as for the stores here, yes, quite a big chain but not sure why it is called "gilgo".
oooooohh, maybe you are entitled to a piece of their profits

poked around on google a bit looking for the origin of the stores name but no leads

saludos,
jer...