Cristian

Also Italian:

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https://www.behindthename.com/name/cristian/top/italy
https://it.m.wiktionary.org/wiki/Cristian
https://it.m.wikipedia.org/wiki/Cristiano_(nome) - listed as a variant

Also Romansh:
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://sursassiala.ch/2015/01/15/familienforschung/
https://nossaistorgia.ch/entries/j4gVkoqVYAp
https://www.portraitarchiv.ch/portrait?page=207

Also Gascon, Provençal and Languedocian: https://ieo-oc.org/spip.php?page=article&id_article=290 --- Source: Institut d'Estudis Occitans

Also Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Lista_de_nomes_masculinos_en_galego

Also Occitan: https://fr.wiktionary.org/wiki/Cristian#Occitan (Source: Joan de Cantalausa, Diccionari General Occitan a partir dels parlars lengadocians, 2002)