Worldwide, Rathnayake (Rathnayake 
) is a rare boy's first name. The first name Rathnayake is habitual in Southern Asia, particularly Sri Lanka, where it is quite a rare masculine name. Predominantly, Rathnayake is the last name as well as the forename.
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| Rathnayake | Indonesia, United Arab Emirates, Sri Lanka, Australia, Bangladesh |
| priyankara rathnayake Sri Lankan actor, LK (b. 1964) |
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| kumarasiri rathnayake Sri Lankan politician (b. 1967) |
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| abeykoon jayalath iresha rathnayake researcher |
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| delima rathnayake researcher (ORCID 0000-0003-4953-441X) |
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| kasun rathnayake researcher (ORCID 0000-0003-3303-9748) |
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| madhuranga rathnayake researcher |
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| bennett rathnayake Sri Lankan filmmaker |
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| pavan rathnayake Sri Lankan cricketer |
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