Cognomen มหากิจศิริ (มหากิจศิริ 
, Mahakitsiri 
) , in the entire world, is a very rare family name. The surname มหากิจศิริ is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| มหากิจศิริ | Thailand |
| Mahakitsiri | Thailand, United States |
Mahagitsiri, and Mahakijsiri
| ประยุทธ มหากิจศิริ Thai politician, TH (b. 1945) |
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| เฉลิมชัย มหากิจศิริ Thai actor, TH (b. 1978) |
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