Heric, "Kelly" is a pretty common girl's name here in the states, certainly here in the mid-Atlantic area. It is not commonly used for a boy. It's possible that a male named "Kelly Collins" could exist, more likely as an immigrant than as a person born here... but neither is as likely as the possibility that Linden's "Kelly" is a woman. What makes you so sure that Kelly is a guy?

Veta Collins must be a relative of "Keely", since "Keely" is listed as the contact name at the Fairfax address.