Last name Blennerhassett (Blennerhassett 
) , in the world, is a rare cognomen. The cognomen Blennerhassett is characteristic of Ireland, where it is quite a rare surname, New Zealand, and Australia. Measured by absolute frequency, it is the most numerous in Australia, Ireland, and the United Kingdom.
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| Blennerhassett | New Zealand, United States, Australia, Ireland, United Kingdom |
| john de blennerhassett English politician (b. 1350) |
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| john blennerhassett (1423-1510) (b. 1423) |
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| sir thomas blennerhassett (1461-1531) (b. 1461) |
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| george blennerhassett (1501-1543) (b. 1501) |
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| mary blennerhassett (1517-1587) (b. 1517) |
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| elizabeth blennerhassett (1537-1608) (b. 1537) |
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| frances blennerhassett Peerage person ID=278988 (b. 1562) |
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| john blennerhassett English judge and politician (b. 1565) |
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| edward blennerhassett (born 1597) (b. 1597) |
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| samuel blennerhassett (born 1600) (b. 1600) |
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| robert blennerhassett Anglo-Irish soldier and politician (b. 1622) |
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| susan blennerhassett Peerage person ID=278910 (b. 1622) |
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| deborah blennerhassett (born 1629) (b. 1629) |
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| mary blennerhassett (1630-1674) (b. 1630) |
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| augustine blennerhassett (1648-1679) (b. 1648) |
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