All around the world, Arunachalam (Arunachalam 
) is quite a rare predominantly masculine, but very seldom female forename. The first name Arunachalam is characteristic of Singapore, where it is quite a rare mostly masculine, but infrequently girly name, United Arab Emirates, where it is a rare male name, and Qatar. In absolute terms, it is the most numerous in India, United Arab Emirates, and Singapore. Likewise, Arunachalam is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Arunachalam | Sri Lanka, United Arab Emirates, India, Malaysia, United States |
| kandasamy arunachalam (b. 1910) |
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| subbiah arunachalam India-based information consultant (b. 1941) |
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| krishnamoorthy arunachalam Indian businessperson (born 1944, child of Mangalam Vaidhyanathan Arunachalam), IN (b. 1944) |
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| pon arunachalam Tamil writer (b. 1946) |
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| kannan arunachalam (b. 1970) |
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| dharmalingam arunachalam researcher ORCID ID = 0000-0003-2949-7199 |
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| prabhu s arunachalam researcher |
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| srinivasan arunachalam Ph.D. Universiteit van Amsterdam and Centrum Wiskunde & Informatica 2018 |
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| viswanathan arunachalam Ph.D. Indian Institute of Technology, Madras 1997 |
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| viswanathan arunachalam researcher |
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| sankara arunachalam researcher (ORCID 0000-0003-3685-3913) |
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| thangasamy arunachalam researcher |
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| valli arunachalam |
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| muthukumarasamy arunachalam |
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| chidambaram arunachalam |
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