No story that I put out on the internet will probably ever use the names Rowan, Thomas, Tristen, or K (and before you tell me that's just a letter, I kind of like single letter names for character nicknames). This is because I never want to get stuck writing because I have to think of a name, so these are the placeholder names I use. K is the main male character, Rowan is the main female, Thomas is the male love interest, and Tristen is the female love interest.
I'll also never use Kennedy, since that's the family name that my name (Kenn) comes from, so it would kind of feel like I was using my own name.
Other than that, as long as I like the name, and it fits the feel of the story, I'll use it. I think the only member of my immediate family that I haven't named a character after is my mom, but it's only a matter of time really.