Um, I guess there are some general no-nos I could discuss about avoiding, if you really wanna hear them. Here they are:
*NEVER end your character's first name with the letter 'S'.It makes it awkward to write possessive forms of the name.
*Don't name your hero Jack. It's waaay too common.
*Don't, if you are going to do this, make your character's name obviously about their personality. Like, if you have a female characetr who likes plants, don't name her Flower. Name her something more subtle such as Sage.
*Make sure the character name is appropriate for the time of birth. A girl in her thirties named Lexi doesn't make much sense, does it?
There you go. There's more, of course but those are just some simple basics. Hope they helped!