The conversation went like this:
Coworker: "Are you a new ... employee?"
Me: "Yes! Hi, my name is Hjalmer!"
Coworker: (speaking slowly) "Hjalmer?"
Me: (politely) "Yes. Hjalmer."
Coworker. "Oh! I had a great uncle with that name!"
Me: (looking pleasantly surprised and nodding)
Coworker: "Is it spelled H-J-A-L-M-E-R?"
Me: "Yes! Exactly!"
Coworker: "Scandinavian?"
Me: "Yes!"
Coworker: "Maybe the two of you are related?"
...
I politely left as quickly as I could.