Puh good questions.. always a matter of what game iam playin and how i feel today.
But Mostly just some generic names like: Sarah, Emma, Ashley, Lilly.
I use a dumb name for every character, Huskybutt. It's probably taking away from immersion but it's a tradition since the first NSFW games I've played.
In a lewd game I love to give names like "slut","whore","cunt","cockhole","spermrag", ... kind of ups some of the dialogue for me
In regular games I usually go with whatever is default
I usually go with the default, because I had several games, where the name I chose was identical to another NPC and it made the conversations difficult to read.
But if I know, what names to avoid in regard to this problem, I usually choose Myrmianda (or short Myr, if I'm lazy).