Críostóir is an Irish masculine given name, a form of "Cristopher".Críostóir, citing Patrick Woulfe, Irish Names and Surnames, 1923, p.53 Notable people with the name include:
Críostóir Ó Floinn (1927–2023), Irish writer
Críostóir is also the native given name of several notable people commonly known under another name, including:
Críostóir Ó Cuana, native name of Christy Cooney Criostóir Ó Laoire, native name of Chris O'Leary Criostóir Ó Tuathaigh, native name of Christy Toye Criostóir Óg Mac Seoin, native name of Chris Óg Jones
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