yttergren
Yttergren is a surname of Swedish origin. It is likely a toponymic surname, meaning it is derived from a place name. While the exact etymology is not definitively documented in widely accessible sources, surnames ending in "-gren" often relate to a branch or a boundary. The prefix "ytter-" could suggest a location that is outer, further away, or at an extremity.
As a surname, Yttergren is found in Sweden and has also spread to other countries through migration,