Last name Hartnett (Hartnett 
, ハートネット, Хартнетт) , in the world, is quite a common cognomen. The cognomen Hartnett is habitual in Ireland, where it is quite a common surname, Malta, and Australia, where it is quite a rare surname. In absolute terms, the name is most common in the United States, Ireland, and Australia.
| VARIANT | COUNTRY |
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| Hartnett | Australia, Canada, Ireland, United States, United Kingdom |
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gabby hartnett American baseball player and coach (1900-1972), US (b. 1900) |
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| pat hartnett American baseball player, US (b. 1863) |
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| patrick joseph hartnett (1876-1944) bushman (b. 1876) |
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thomas f. hartnett American politician, US (b. 1941) |
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| laurence hartnett Australian businessman, AU (b. 1898) |
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p-p hartnett British writer, IE (b. 1958) |
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| noel hartnett Irish politician, IE (b. 1909) |
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| pat hartnett Australian rules footballer, AU (b. 1910) |
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| robert c. hartnett (b. 1904) |
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angela hartnett British chef, GB (b. 1968) |
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| charles william hartnett (b. 1909) |
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| william e. hartnett American lawyer and politician, US (b. 1919) |
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| josie hartnett Irish hurler, IE (b. 1927) |
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| jimmy hartnett Irish footballer (1927-1988), IE (b. 1927) |
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josh hartnett American actor and producer, US (b. 1978) |
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