Cognomen Hartline (Hartline 
) , in the entire world, is quite a rare family name. The cognomen Hartline is characteristic of the United States, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in the United States, Canada, and Poland.
| VARIANT | COUNTRY |
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| Hartline | Australia, United States, Poland, Canada, New Zealand |
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haldan keffer hartline American neuroscientist, US (b. 1903) |
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mary hartline American actress, US (b. 1926) |
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| elizabeth k. hartline US environmental activist, US (b. 1909) |
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brian hartline American football player, US (b. 1986) |
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| beverly karplus hartline American physicist, US (b. 1950) |
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| jason d. hartline Ph.D. University of Washington 2003 (b. 1976) |
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| christopher j hartline researcher (ORCID 0000-0002-6030-911X) |
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| douglas r hartline researcher |
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| andrew hartline American football player, US (b. 1985) |
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| mike hartline American football player, US (b. 1988) |
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| jeff hartline American politician, US (b. 1989) |
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| hannelore hartline |
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