I got few ocs but two I use the most!
first one has a last name "Janes" and since its mostly a self insert I made it sound like my own last name and my second oc has the last name "Star"
Tbh I made it like that first bc it sounds nice like "Summer Star" sounds good for me (yes Summer is a real name a lot of people have it ^^) but kind of it matches the personality I was going for? In a way they're really energetic and the type of friend many would call the sun and the sun is a star so it's cool