It's not that rare. I've seen a lot of people not related to me have it as well. But I can pretty much guarantee that I'm the only on TBT that has it. lol
I wouldn't say my surname is common nor uncommon. It's just not something you hear a lot, but when you hear it you're just like "oh right, that's a surname you can have". That said, I really hate it, alongside my first name. Growing up with a first name as common as mine, my name was never just "Jake", it was always paired with my surname because there were so many Jake's at my school, and I hated it. Every time someone calls me by or asks me for my surname, it bothers me to no extent.