Cognomen กตัญญูตานนท์ (กตัญญูตานนท์ 
) , all over the world, is a very rare family name. The cognomen กตัญญูตานนท์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| กตัญญูตานนท์ | Thailand |