I went to school in New Haven Vermont, in the 1940's and early 1950's. There was a family who had children in my school that might just possibly be related to your La Rock. I believe they spelled the name Laroque however, which is probably the French version. Soundex searching might be your best bet, as many anglicised names were spelled differently each generation. Hope this proves to be of some help. a native Vermonter lost in Texas Gene Warner