Cognomen Mwinyi (Mwinyi 
, معيني 
) , in the entire world, is a common family name. The family name Mwinyi is characteristic of Tanzania, where it is quite a common surname, Iran, and Kenya, where it is quite a rare surname. Very seldom, Mwinyi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mwinyi | Saudi Arabia, United Arab Emirates, Kenya, Tanzania, Democratic Republic of the Congo |
| معيني | Saudi Arabia, Iran, Yemen, Syria, Lebanon |
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hussein ali mwinyi President of Zanzibar, TZ (b. 1966) |
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| siti mwinyi First Lady of Tanzania (b. 1932) |
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| mohamed abdulrahman mwinyi Tanzanian politician, TZ (b. 1964) |
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| maryam azan mwinyi Tanzanian politician, TZ (b. 1972) |
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| abdullah mwinyi Tanzanian politician (born 1974), TZ (b. 1974) |
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| mwinyi kazimoto Tanzanian footballer, TZ (b. 1988) |
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| mwinyi kazimoto (b. 1988) |
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