Interesting! I honestly had no idea that
Marion has usage in Romania. I also know a 66 year old man called
Marion, from the Southeastern US. Yet, I’ve mainly known women called
Marion and
Marian. I could see it being used for a boy, but it sounds very feminine to me; I don’t know why that it does. Maybe since
Marion sounds very close to “
Mary” in my tongue. I don’t think that
Marion is only a girl name, but I do get a feminine impression. Due to that, I’d only personally use it for a girl. Though, I bet your friend suits the name very well, whatever his personality is! The 66 year old man used to be a baseball coach, and loved to wrestle; so, that’s the impression I get of male
Marion.