At work, I end up working with this guy occasionally. His name is a common name...David. However, he would prefer to go by a nickname. Which I'm usually cool with. I'm thinking in this case...Dave. Nope, he wants to be called by his childhood nickname...Frog. I can't do it. I just can't. I understand that is his preference, but... I can't. It's a professional environment, I can't bring myself to call a guy Frog. For the record, I don't think I could do it in a personal setting either. My brain does not compute.
Does anyone else have any experience with this? Should I just suck it up and call the guy Frog? He signs his emails with it.
ETA: So far, I just haven't been calling him anything. Just a bunch of "hey"s. I'm just concerned about future encounters.