All around the world, Effi (Effi 
) is quite a rare epicene first name. The first name Effi is habitual in Indonesia, where it is a rare dominantly female, but infrequently masculine name, Nigeria, where it is a rare gender-neutral name, and Greece, where it is a rare feminine name. Measured by absolute frequency, it most frequently occurs in Indonesia, Nigeria, and Mexico. Very seldom, Effi is the last name as well as the forename.
| effi biedrzynski German opinion journalist and writer (1910-2004), DE (b. 1910) |
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| effi grieg-gemeinhardt Austrian painter and writer, AT (b. 1941) |
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| effi wizen Israeli animator, IL (b. 1956) |
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| effi setiawati Indonesian politician (born 1963 in Jakarta), ID (b. 1963) |
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| effi roefaida ID (b. 1963) |
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| effi b. rolfs DE (b. 1968) |
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| effi helmy ariffin researcher (ORCID 0000-0002-8534-0113) |
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| effi kuswita Indonesian political candidate, ID |
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| effi haque researcher |
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| effi cohen Ph.D. Bar-Ilan University 2009 |
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| effi wies researcher |
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| effi rabsilber DE (b. 1978) |
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| effi agami |
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