Family name Bilby (Bilby 
) , worldwide, is quite a rare cognomen. The surname Bilby is habitual in New Zealand, where it is a rare surname, the United Kingdom, and Australia. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Brazil. Much less frequently, Bilby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Bilby | United Kingdom, Australia, Brazil, United States, India |
| thomas bilby (b. 1794) |
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| john s. bilby American rancher (b. 1832) |
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kenneth w. bilby American businessman, US (b. 1918) |
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richard bilby American judge (1931-1998), US (b. 1931) |
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joseph g. bilby American author, US (b. 1943) |
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| bruce bilby mechanical engineer (b. 1922) |
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| grahame bilby New Zealand association footballer, NZ (b. 1941) |
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| kenneth m. bilby American anthropologist, ethnomusicologist, and author (b. 1953) |
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| mark g. bilby researcher |
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| glenn bilby researcher |
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