Cognomen Lahtum (Lahtum 
) , in the world, is a very rare family name. The cognomen Lahtum is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Lahtum | Thailand |
Suphot, Bulgis, Tassanee, Supasinee, and Sutassanai