Cognomen Japp (ヤップ 
, Japp 
) , all over the world, is quite a rare family name. The family name Japp is habitual in Jamaica, where it is a rare surname, Denmark, and Germany. Measured by absolute frequency, it is commonest in the United States, Germany, and the United Kingdom. Very seldom, Japp is the forename as well as the last name.
| VARIANT | COUNTRY |
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| ヤップ | Japan |
| Japp | Germany, Indonesia, United Kingdom, United States, Canada |
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francis robert japp British chemist (1848-1925), GB (b. 1848) |
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| alexander hay japp Scottish author and publisher (1837-1905), GB (b. 1837) |
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| john japp local politician and Lord Mayor of Liverpool (b. 1844) |
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| henry japp Sir Henry Japp (1869-1939) 1939 Obituary [1] 1939 Obituary [2] "...have to record the death last Saturday, April 8th, at his home in B... (b. 1869) |
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| francis vivian japp (born 1870) (b. 1870) |
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| darsie japp British artist, GB (b. 1883) |
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| klaus peter japp German university teacher, DE (b. 1947) |
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| uwe japp German germanist and specialist in literature, DE (b. 1948) |
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| mikel japp musician, US (b. 1952) |
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| andrea h. japp French scientist and author, FR (b. 1957) |
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| miriam japp German film actor and stage actor, DE (b. 1968) |
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| stephanie japp Swiss-German actress, DE (b. 1972) |
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| shauna japp Canadian stage manager. |
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| francis robert japp Ph.D. Ruprecht-Karls-Universität Heidelberg 1875 |
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| alberto sada japp researcher (ORCID 0000-0001-8106-8987) |
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