I have a very common first name (Dave) and a very uncommon last name (Pifke, pronounced PIF-key). The majority of my close friends call me by my last name, since there are several other Daves and Davids in our friend group.

My brother's friends do likewise, since his first name is Mike and he runs with a bunch of other Mikes and Michaels.

There's a naming collision when my brother and I hang out together, but since we live in different states, the system usually works.