Last name Koulab (Koulab 
) , globally, is an extremely rare family name. Much more prevalently, Koulab is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koulab | United States, India, Laos, France |
Phonetheva, Souvannatovan, Phommarath, Chantharasy, and Chanthavong