Cognomen Weerasooriya (Weerasooriya 
) , in the world, is a common last name. The cognomen Weerasooriya is characteristic of Sri Lanka, where it is quite a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates, where it is a rare surname. In absolute terms, it most frequently occurs in Sri Lanka, Australia, and Indonesia.
| VARIANT | COUNTRY |
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| Weerasooriya | Indonesia, Sri Lanka, Australia, United Arab Emirates, United States |
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arnolis weerasooriya Colonel of the Salvation Army (b. 1854) |
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| hubert weerasooriya Sri Lankan lawyer and author (b. 1916) |
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| c. s. weerasooriya Sri Lankan general (b. 1943) |
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| aruna weerasooriya botanist (b. 1962) |
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| nayomini weerasooriya Sri Lankan journalist, entrepreneur and writer (b. 1965) |
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| nilusha weerasooriya researcher |
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| gayani weerasooriya researcher |
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| rukshen weerasooriya researcher |
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| nayana weerasooriya researcher (ORCID 0000-0003-2907-4380) |
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| n. e. weerasooriya Sri Lankan lawyer |
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Mr, Sunil, Senal, Anura, Anoja, Aruna, Amila, Amith, Ashen, Asiri, Asela, Asoka, Akila, Ajith, A N C, Chuck, Kasun, Kayla, Kelum, Kevin, Sachi, Sahan, Samal, Saman, Wa, K G, Raz, Dil, Don, Lyn, Eng, Maya, Mike, Puraj, Sabu, Anil, Ravi, Dale, Daya, Tula, Evan, Udul, Mohan, Sarth, Siri, and Rupun