Last name Niini (Niini 
) , around the globe, is a rare family name. The surname Niini is characteristic of Finland, where it is quite a rare surname, Estonia, where it is a rare surname, and Tanzania. Much less frequently, Niini is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niini | Colombia, Tanzania, Estonia, Finland, France |
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aarno niini Finnish politician and sprinter (1905-1972), FI (b. 1905) |
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| eino niini Finnish economist, FI (b. 1902) |
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| risto niini Finnish physicist, FI (b. 1907) |
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| niini loona EE (b. 1903) |
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| heikki niini Finnish geologist (1937-2008), FI (b. 1937) |
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| eero niini Finnish artist |
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| tarmo niini researcher (ORCID 0000-0001-8876-1151) |
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