Across the world, นรรถยา (นรรถยา 
) is a very rare mostly feminine, but infrequently male given name. The first name นรรถยา is habitual in South-eastern Asia, particularly Thailand, where it is a very rare epicene name.
| VARIANT | COUNTRY |
|---|---|
| นรรถยา | Thailand |
นภาลัย, and เล็กสุทธิ์