Surname Blackwelder (Blackwelder 
) , in the entire world, is quite a rare last name. The cognomen Blackwelder is characteristic of the United States, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Canada, and France.
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| Blackwelder | Germany, Canada, France, New Zealand, United States |
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eliot blackwelder American geologist (1880-1969), US (b. 1880) |
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| richard e. blackwelder American biologist, professor, author, US (b. 1909) |
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| ruth maccoy blackwelder author, philatelist, biologist, US (b. 1910) |
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| kent blackwelder American reality television participant, US (b. 1950) |
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| myra vanhoose blackwelder golfer (1955-), US (b. 1955) |
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| ruth blackwelder North Carolina writer and historian, US |
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| ron f. blackwelder American aerospace engineer, US |
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| william blackwelder researcher |
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| stephen blackwelder researcher |
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| garrett blackwelder college basketball player (1997–2000) East Carolina |
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| eliot b. blackwelder |
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| claire blackwelder American actress, US (b. 1993) |
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