Surname Raghallaigh (Raghallaigh 
) , all over the world, is a rare cognomen. The surname Raghallaigh is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States.
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| Raghallaigh | United Kingdom, Ireland, United States |
| máel ísa ó raghallaigh Irish musician, IE (b. 1636) |
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| éadbhard ó raghallaigh Irish scholar (b. 1765) |
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| tomás ó raghallaigh Irish writer, IE (b. 1883) |
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| seán seosamh ó raghallaigh Gaelic footballer, IE (b. 1919) |
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| pádraic ó raghallaigh IE (b. 1924) |
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| caoimhín ó raghallaigh Irish musician, IE (b. 1979) |
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| muireann ní raghallaigh researcher ORCID ID = 0000-0003-3144-8097 |
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| riobárd ó raghallaigh IE |
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| máirtín ó raghallaigh Gaelic footballer, IE (b. 1993) |
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