Surname Blackham (Blackham 
) , in the entire world, is quite a rare last name. The cognomen Blackham is habitual in the United Kingdom, where it is quite a rare surname, New Zealand, where it is a rare surname, and Australia. Measured by absolute frequency, the name is most common in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
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| Blackham | Canada, United Kingdom, United States, New Zealand, Australia |
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henry hamilton blackham (b. 1817) |
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jack blackham Australian cricketer (1854-1932), AU (b. 1854) |
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| john blackham Blackham, John (1834–1923), founder of the Pleasant Sunday Afternoon movement (b. 1834) |
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ernest blackham Footballer (1898-1966), GB (b. 1898) |
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h. j. blackham British philosopher, GB (b. 1903) |
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| robert j. blackham Anglo-Irish author, barrister, medical doctor, officer in the Royal Army Medical Corps and historian, GB (b. 1868) |
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| fred blackham Australian rules footballer, AU (b. 1873) |
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| sam blackham English footballer, GB (b. 1890) |
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| dorothy blackham Irish illustrator, artist, and teacher, IE (b. 1896) |
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denis blackham English mastering engineer, GB (b. 1952) |
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| olive blackham (b. 1899) |
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| joseph leslie blackham Royal Navy officer (1912-2004), GB (b. 1912) |
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george warren blackham English artist (fl. 1870–1906) |
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| joyce blackham opera singer (b. 1934) |
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| jeremy blackham Royal Navy admiral (b. 1943) |
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