I don’t have kids of my own, but growing up both of my parents went by their first names. They were kind of rare in that. My mom liked it because otherwise my friends would call her Mrs. (my last name) which was not her last name as my parents were divorced. I call some of my friends parents mom, but never do that to the dads. I have one friend who I get along well with one of her aunts, and I call her Aunt Patty, just like my friend does. I often say “hi mom!” when being introduced to someone’s mom, especially if my friend says, “this is my mom” and doesn’t tell me the name.