Cognomen นิลสยาม (นิลสยาม 
, Nilpiam ) , worldwide, is a rare surname. The cognomen นิลสยาม is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, นิลสยาม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nilpiam, นิลสยาม | Thailand |