Last name Threlfall (Threlfall 
) , in all the world, is quite a rare family name. The cognomen Threlfall is characteristic of Isle of Man, where it is quite a rare surname, the United Kingdom, and Australia. In absolute terms, the name is most common in the United Kingdom, Australia, and the United States.
| VARIANT | COUNTRY |
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| Threlfall | Australia, Canada, United States, New Zealand, United Kingdom |
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richard threlfall British chemist (b. 1861) |
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| richard threlfall (b. 1804) |
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| george threlfall English-born Australian engineer and entrepreneur, AU (b. 1819) |
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| jennette threlfall British hymn writer, religious poet, GB (b. 1821) |
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william threlfall German mathematician, DE (b. 1888) |
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| martha broadley threlfall (born 1851) (b. 1851) |
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| t. r. threlfall British trade unionist (b. 1852) |
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| edith mary threlfall (1856-1896) (b. 1856) |
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| hester threlfall (born 1858) (b. 1858) |
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| lucy anne threlfall (born 1861) (b. 1861) |
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| william threlfall botanist (1865-1888) (b. 1865) |
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| thomas threlfall Titanic survivor (b. 1867) |
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| fred threlfall English association football player, GB (b. 1880) |
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| george threlfall Australian rules footballer, AU (b. 1899) |
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| red threlfall American sports coach (1903–1971), US (b. 1903) |
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