Last name Dennehy (Dennehy 
, דנהי 
) , around the globe, is quite a rare surname. The cognomen Dennehy is habitual in Ireland, where it is quite a common surname, New Zealand, where it is quite a rare surname, and Australia. Measured by absolute frequency, it is the most numerous in the United States, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| Dennehy | United Kingdom, Australia, Canada, United States, Ireland |
| דנהי | Israel |
| henry e. dennehy Irish Anglican archdeacon and writer, IE (b. 1820) |
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| thomas dennehy British Indian Army general (b. 1829) |
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| william francis dennehy Irish journalist (b. 1853) |
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brian dennehy American actor (1938-2020), US (b. 1938) |
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elizabeth dennehy American actress, US (b. 1960) |
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| anselm donald mary dennehy Roman Catholic clergyman (b. 1919) |
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donnacha dennehy Irish composer, IE (b. 1970) |
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| raymond l. dennehy professor emeritus of philosophy (1934-2021), US (b. 1934) |
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| dennis dennehy Irish political activist (b. 1938) |
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darren dennehy Irish footballer, IE (b. 1988) |
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| john dennehy Irish politician, IE (b. 1940) |
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| rosemary anne dennehy (born 1944) (b. 1944) |
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| raymond dennehy (b. 1934) |
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| sarah elizabeth dennehy (born 1949) (b. 1949) |
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| mick dennehy American football player and coach, US (b. 1950) |
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