Worldwide, Shanmugaratnam (Shanmugaratnam 
) is an extremely rare boy's given name. Likewise, Shanmugaratnam is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Shanmugaratnam | Germany, Australia, Canada, Sri Lanka, Singapore |
| kanagaratnam shanmugaratnam Singaporean pathologist, SG (b. 1921) |
|