Last name Pachamuthu (Pachamuthu 
) , in the world, is a rare surname. The cognomen Pachamuthu is characteristic of Malaysia, where it is a rare surname, United Arab Emirates, and Kuwait. Measured by absolute frequency, this name is the most popular in Malaysia, India, and United Arab Emirates. Much less frequently, Pachamuthu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Pachamuthu | Saudi Arabia, United Arab Emirates, Malaysia, India, Oman |
| pachamuthu, n. Indian politician, IN |
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| pachamuthu balakrishnan researcher (ORCID 0000-0002-1710-9155) |
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| parivendar pachamuthu, t.r. Indian politician, IN |
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| rajalakshmi pachamuthu researcher (ORCID 0000-0002-7252-6728) |
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