Last name Alagarsamy (Alagarsamy 
) , across the world, is quite a rare family name. The surname Alagarsamy is characteristic of Brunei, where it is quite a rare surname, Sri Lanka, and United Arab Emirates. Not in comparison with a country's population, this name is the most popular in India, Sri Lanka, and Malaysia. Very seldom, Alagarsamy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Alagarsamy | United Arab Emirates, Sri Lanka, Malaysia, United States, India |
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s. alagarsamy Indian politician, IN (b. 1926) |
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| kothai priyadharshini alagarsamy PhD, University of Washington, 2019 |
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| karthikeyan alagarsamy researcher (ORCID 0000-0003-4201-3726) |
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| keshav narayan alagarsamy researcher (ORCID 0000-0002-7363-9345) |
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| alagarsamy pandikumar researcher |
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| subburaj alagarsamy researcher |
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| sumithra alagarsamy researcher |
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