Surname Nandasiri (Nandasiri 
) , worldwide, is quite a rare cognomen. The cognomen Nandasiri is characteristic of Sri Lanka, where it is quite a common surname, Qatar, where it is quite a rare surname, and Kuwait, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Sri Lanka, Myanmar, and Saudi Arabia. Much less frequently, Nandasiri is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Nandasiri | Qatar, Saudi Arabia, Sri Lanka, Malaysia, Myanmar |
| sanath nandasiri musician, LK (b. 1942) |
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| manjula nandasiri researcher ORCID ID = 0000-0002-9916-1175 |
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| gayani k nandasiri researcher |
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| nandasiri jasentuliyana United Nations official |
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