Surname Singarajan (Singarajan 
) , in the world, is a very rare last name. The cognomen Singarajan is characteristic of Malaysia, where it is a very rare surname, India, where it is an extremely rare surname, and Canada. Measured by absolute frequency, this name is the most popular in India, Malaysia, and the United States. Also, Singarajan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Singarajan | United States, India, Malaysia, Canada |