Cognomen Alagappan (Alagappan 
, அழகப்பன்) , around the world, is quite a rare last name. The surname Alagappan is characteristic of Singapore, where it is quite a rare surname, Malaysia, and United Arab Emirates. Measured by absolute frequency, this name is the most popular in India, Malaysia, and Singapore. Likewise, Alagappan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Alagappan | United Arab Emirates, Malaysia, Indonesia, India, Singapore |
| sankarankoil chidambaranatha alagappan (b. 1892) |
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| alagappa alagappan (b. 1925) |
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| alagappan arunachalam murugappan Indian businessperson (born 1943, child of Arunachalam Murugappanmurugappan Arunachalam), IN (b. 1943) |
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| m a alagappan (b. 1940) |
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arun alagappan American businessman, US |
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| alagappan n. Indian cinematographer, IN (b. 1957) |
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| alagappan annamalai researcher ORCID ID = 0000-0002-5210-2645 |
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| alagappan ponnalagu former Ph.D. candidate in Texas A&M University's Dept. of Mechanical Engineering |
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| m arun alagappan |
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