Surname Tennakoon (Tennakoon 
) , throughout the world, is a common cognomen. The cognomen Tennakoon is habitual in Sri Lanka, where it is a common surname, United Arab Emirates, where it is quite a rare surname, and Qatar. Measured by absolute frequency, this name is the most popular in Sri Lanka, Bangladesh, and Australia. Much less frequently, Tennakoon is the forename as well as the last name.
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| Tennakoon | United Arab Emirates, Bangladesh, Australia, Sri Lanka, Indonesia |
| raipiyel tennakoon Sri Lankan poet (1899–1965) (b. 1899) |
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| tennakoon vimalananda (b. 1907) |
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| piyasena tennakoon ceylonese lawyer and politician (b. 1917) |
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| p. m. k. tennakoon ceylonese politician (b. 1917) |
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| janaka bandara tennakoon Sri Lankan politician, LK (b. 1953) |
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| soma kumari tennakoon politician (1960-2009), LK (b. 1960) |
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| nilmini tennakoon Sri Lankan film actress, LK (b. 1965) |
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| pramitha tennakoon Sri Lankan politician (b. 1978) |
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| sumudu tennakoon researcher |
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| upali tennakoon Sri Lankan journalist |
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| mithila tennakoon researcher |
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| ruwan b tennakoon researcher |
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| parinda tennakoon researcher |
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| danushka s. tennakoon Thai mycologist |
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| gayani tennakoon researcher |
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