No. It's a perfectly normal name in Newfoundland. It's actually pronounced "hiss-cock" and it's a pretty common surname in Newfoundland. Someone with the last name Hiscock to me is as common as someone with the last name Nelson to you if you live in parts of the US. As funny as it is to see it written, the negative connotations wouldn't have been as obvious to anyone familiar with the surname. We're talking about a place where Butt and Badcock are also common surnames and there are towns with names like Dildo, Spread Eagle, Blow Me Down and Come by Chance. We're talking about a province where there are people literally named Dick Butt from South Dildo and no one bats an eye. Landon Hiscock probably wouldn't even be picked up on by the schoolyard bully contingent.
*Edit* Like, look at
this as an example. Hiscock House: The Tale of an Entrepreneurial Woman. To an outsider is reads like "His Cock House: The Tale of an Entrepreneurial Woman." If you were from Newfoundland you wouldn't even pick up on that double entendre because it's a perfectly normal surname.