Grim (mainly this spelling) is a very old name here in Sweden, and it's very rare these days. I don't think other people think it sounds surnamey though, but I have a hard time not to since my own surname ends in -grim.
Let us step into the night and pursue that flighty temptress, adventure.
PNL: http://www.behindthename.com/pnl/45898
Top: Alice and Matteo
Bottom: Kenzie and Deacon
'Eggbert' due December 2018