Cognomen Monahan (Monahan 
) , around the globe, is a common family name. The surname Monahan is habitual in Ireland, where it is quite a common surname, the United States, where it is quite a rare surname, and Australia. Measured by absolute frequency, the name is most common in the United States, Ireland, and Canada.
| VARIANT | COUNTRY |
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| Monahan | United Kingdom, Australia, Ireland, United States, Canada |
| james henry monahan Irish judge (b. 1803) |
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james g. monahan American politician (1855-1923), US (b. 1855) |
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william henry monahan politician in Massachusetts, US (b. 1857), US (b. 1857) |
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| thomas monahan (1812-1889) businessman (b. 1812) |
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george f. monahan politician in Massachusetts, US, US (b. 1867) |
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john l. monahan politician in Massachusetts, US, US (b. 1883) |
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robert monahan (1898-1975) barrister and judge, AU (b. 1898) |
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| mary monahan (1861-1909) (b. 1861) |
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| michael monahan American journalist (1865-1933), IE (b. 1865) |
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| r. c. n. monahan American architect, US (b. 1873) |
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| francis john monahan (b. 1865) |
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| alfred monahan Bishop of Monmouth (b. 1877) |
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| peter joseph monahan Roman Catholic archbishop (b. 1882) |
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| p. j. monahan Pulp artist (1882-1931), US (b. 1882) |
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george l. monahan, jr. American Air Force general, US (b. 1933) |
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