Last name Idah (Idah 
) , all over the world, is a common cognomen. The cognomen Idah is habitual in Israel, where it is quite a common surname, Brunei, and Bahamas, where it is quite a rare surname. In absolute terms, it is the most numerous in Israel, Indonesia, and Nigeria. Also, Idah is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Idah | South Africa, Kenya, Israel, Indonesia, Nigeria |
| idah avishai (b. 1919) |
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idah waringa Kenyan sports journalist, KE |
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adam idah Irish association football player, IE |
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| idah sithole-niang Zimbabwean biochemist and educator, ZW (b. 1957) |
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| idah syahidah rusli habibie Indonesian politician, ID (b. 1964) |
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| idah hadijah (b. 1962) |
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| idah peterside association football player, NG (b. 1974) |
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| idah nabayiga Ugandan politician, UG (b. 1979) |
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| idah mweene-ndumba researcher |
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| idah mokhele researcher, ORCID id # 0000-0002-8054-0116 |
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| idah manduna researcher (ORCID 0000-0001-9734-1167) |
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| idah adhiambo orowe Ph.D. University of Nairobi 2016 |
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| idah mugambi researcher (ORCID 0000-0001-9895-0618) |
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| idah chatindiara researcher ORCID ID = 0000-0003-4747-648X |
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