Last name Rathnayake (Rathnayake 
) , worldwide, is a common family name. The cognomen Rathnayake is characteristic of Sri Lanka, where it is a common surname, Maldives, where it is quite a common surname, and United Arab Emirates, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Sri Lanka, United Arab Emirates, and Indonesia. Very seldom, Rathnayake is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rathnayake | Indonesia, United Arab Emirates, Sri Lanka, Australia, Bangladesh |
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rumeshika rathnayake Sri Lankan sprinter, LK (b. 1996) |
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| somapala rathnayake Sri Lankan music director, LK (b. 1947) |
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| thilak kumara rathnayake Sri Lankan actor and announcer (b. 1960) |
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| jayantha rathnayake Sri Lankan musician (1969–2020), LK (b. 1968) |
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| anurudha rathnayake Sri Lankan boxer, LK (b. 1975) |
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| navantha rathnayake cricketer, LK (b. 1979) |
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| hasanga rathnayake researcher (ORCID 0000-0003-1994-571X) |
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| darshana n rathnayake researcher (ORCID 0000-0002-4238-6533) |
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| hemali rathnayake researcher |
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| asanka s rathnayake researcher ORCID ID = 0000-0002-5460-397X |
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| suramya i. rathnayake researcher ORCID ID = 0000-0002-4176-9284 |
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| chamil rathnayake researcher |
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| buddhika rathnayake researcher (ORCID 0000-0001-9214-050X) |
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| sumedha rathnayake Ph.D. Purdue University 2015 |
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| nirmala rathnayake researcher |
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