In the world, Blennerhassett (Blennerhassett 
) is an extremely rare unknown gender first name. Much more prevalently, Blennerhassett is the last name as well as the forename.
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| Blennerhassett | Australia, New Zealand, United Kingdom, United States, Ireland |
Blennerhassett is also a name for the fictitious and mythical characters: .
| conway blennerhassett Irish politician (b. 1693) |
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harman blennerhassett Anglo-Irish lawyer and plantation owner (1765–1831), GB (b. 1764) |
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| sir rowland blennerhassett, 1st baronet Anglo-Irish lawyer and baronet (b. 1741) |
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| rowland blennerhassett (1780-1854) (b. 1780) |
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| rowland blennerhassett (born 1795) (b. 1795) |
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| nevinson de courcy blennerhassett (1812-1853) (b. 1812) |
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| sir rowland blennerhassett, 4th baronet Anglo-Irish baronet, politician, IE (b. 1839) |
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| blennerhassett montgomery blennerhassett (born 1849) (b. 1849) |
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| rowland blennerhassett British politician (1850-1913) (b. 1850) |
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| rowland manders blennerhassett (born 1860) (b. 1860) |
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| rowland hamilton blennerhassett (1867-1950) (b. 1867) |
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| sir arthur charles francis bernard blennerhassett, 5th bt. (1871-1915) (b. 1871) |
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| rowland james blennerhassett (born 1897) (b. 1897) |
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| sir marmaduke charles henry joseph casimir blennerhassett, 6th bt. (1902-1940) (b. 1902) |
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| rowland blennerhassett (b. 1909) |
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