Surname Kahan (Kahan 
, Кахан 
, כהן 
, and others...) , in all the world, is a common cognomen. The family name Kahan is habitual in Western Asia, particularly Israel, where it is a widespread surname, Oman, where it is quite a common surname, and Saudi Arabia. Measured by absolute frequency, it is the most numerous in Israel, the United Kingdom, and Saudi Arabia. Very seldom, Kahan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kahan | United Kingdom, Japan, India, Bangladesh, Saudi Arabia |
| Кахан | Ukraine, Russia, Kazakhstan |
| קאהאן, כהן, קאהן | Israel |
| isidor kahan holocaust victim, b. 1860-01-05, CZ (b. 1860) |
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| ernestine kahan holocaust victim, b. 1863-09-27, CZ (b. 1863) |
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| etta kahan holocaust victim, b. 1866-04-23, BY (b. 1866) |
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| israel issar kahan (b. 1858) |
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| jenny kahan holocaust victim, b. 1871-03-16, DE (b. 1871) |
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| sima kahan holocaust victim, b. 1875-02-20 (b. 1875) |
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william kahan Canadian mathematician and computer scientist, CA (b. 1933) |
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| moses kahan holocaust victim, b. 1884-07-28, CZ (b. 1884) |
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| zelda kahan British political activist (1886-1969), GB (b. 1886) |
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| izrael kahan Latvian journalist, LV (b. 1888) |
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| henry o. kahan American lawyer and politician, US (b. 1891) |
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| franz kahan holocaust victim, b. 1897-08-24 (b. 1897) |
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| refoel nachman kahan Chabad Rabbi (b. 1897) |
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judith kahan American actress, US (b. 1948) |
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| else kahan holocaust victim, b. 1900-04-15 (b. 1900) |
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