Family name Wiljam (Wiljam 
) , worldwide, is an extremely rare cognomen. Much more prevalently, Wiljam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Wiljam | Germany, Finland, India, Poland, Netherlands |
Bal, Sundstrã M, Tschernij, Reinikainen, Rautiainen, Smolensky, Herjanto, Tichelaar, Peltomaa, Kanervisto, Mäkinen, Van Noorel, Viitanen, Timgren, Roponen, Moorsel, Ylitalo, Eklund, Simula, Hadad, Halli, Fors, None, Töyrylä, and Schellekens