Cognomen Jayasiri (Jayasiri 
) , globally, is quite a common family name. The family name Jayasiri is characteristic of Sri Lanka, where it is quite a common surname, Qatar, where it is quite a rare surname, and Malaysia, where it is a rare surname. In absolute terms, it is the most numerous in Sri Lanka, Malaysia, and Saudi Arabia. Much less frequently, Jayasiri is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jayasiri | Saudi Arabia, Malaysia, United Arab Emirates, Indonesia, Sri Lanka |
| jayasiri semage Sri Lankan artist and newspaper illustrator (b. 1938) |
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| w. jayasiri Sri Lankan actor, LK (b. 1947) |
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| s.c. jayasiri mycologist |
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| amila jayasiri (b. 1994) |
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