Surname Karlstroem (Karlstroem 
) , all around the world, is a rare cognomen. The last name Karlstroem is characteristic of Northern Europe, particularly Norway, where it is quite a rare surname, Sweden, and Finland, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Norway, Sweden, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Karlstroem | Germany, Sweden, Norway, Italy, Spain |
Karlström, and Karlstrøm