Last name Delph (Delph 
, Delf 
) , around the world, is quite a rare cognomen. The last name Delph is habitual in Guyana, where it is quite a rare surname, the United States, where it is a rare surname, and the United Kingdom. In absolute terms, it most frequently occurs in the United States, the United Kingdom, and France. Likewise, Delph is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Delph | United Kingdom, Democratic Republic of the Congo, France, Cameroon, United States |
| Delf | United Kingdom, Democratic Republic of the Congo, France, United States, Germany |
| dorothea delph DE (b. 1728) |
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| john m. delph American politician (1805-1891), US (b. 1805) |
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| leonard william delph British born New Zealand teacher, archaeologist, conservationist and soldier, NZ (b. 1892) |
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marvin delph American basketball player, US (b. 1956) |
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fabian delph English association football player (born 1989), GB (b. 1989) |
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| paul delph American musician, US (b. 1957) |
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| lynda delph american biologist, US (b. 1957) |
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| mike delph American politician, US (b. 1970) |
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| gary delph college basketball player (1981–1984) Tulane |
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| ronald delph college basketball player (2016–2018) Florida Atlantic |
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| jonathan r delph researcher |
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| katie delph researcher (ORCID 0000-0003-0259-7210) |
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| adrian delph American basketball player |
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| norm delph college basketball player (1960–1963) Tulane |
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| micah delph college basketball player (2012–2012) Stephen F. Austin |
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