Cognomen Muthunayagam (Muthunayagam 
) , worldwide, is a very rare last name. The surname Muthunayagam is characteristic of Singapore, where it is a very rare surname, Malaysia, and Canada. Measured by absolute frequency, it is the most numerous in India, Malaysia, and Singapore. Much less frequently, Muthunayagam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Muthunayagam | Malaysia, Singapore, United States, India, Canada |
| a. e. muthunayagam chief architect of rocket propulsion in India, IN (b. 1939) |
|