Last name Jayarathna (Jayarathna 
) , in all the world, is a common cognomen. The surname Jayarathna is characteristic of Sri Lanka, where it is quite a common surname, Maldives, where it is quite a rare surname, and Qatar. Measured by absolute frequency, it is the most numerous in Sri Lanka, United Arab Emirates, and Saudi Arabia. Very seldom, Jayarathna is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jayarathna | Qatar, Saudi Arabia, United Arab Emirates, South Korea, Sri Lanka |
| sidney jayarathna Sri Lankan politician, LK |
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| titus jayarathna researcher (ORCID 0000-0002-1849-4235) |
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| y. n. jayarathna |
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| akila jayarathna Sri Lankan musical artist, LK (b. 1995) |
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Sam, Chani, Kalum, Kasun, Kavya, Kemil, Kusal, Pasan, Pavan, Piumi, Akila, Ranga, Ruwan, Dasun, Daham, Dilan, Dimal, Dulan, Ganga, Gayan, Gawry, Rohan, Geeth, Asoka, Adapa, Ems, Anil, Ravi, Dona, Jaya, Upul, Milan, Muthu, Sanju, Asela, Sanka, Sahan, Sachi, Suren, Sunil, Supun, Anura, Anoma, Aruna, Amila, Saman, and Gihan