Modern spelling would had been Cristóbal Rodríguez de Santa Ana.
The original records show Xtobal, this is an abbreviation since the church didn't approve to write the full name Christ on records.
Old Spanish spellings weren't mistakes, it was they way scribes/writers were educated to do so, is important to keep original forms and document them to map the linguistic evolution of the names and find more about their origins.
LDS FamilySearch.org, "México bautismos, 1560-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JMPS-F65 : 8 March 2018), Xptobal. Rodrigues Santa Ana, 09 Jul 1702; citing , reference v 4 p 15; FHL microfilm 226,647.
LDS FamilySearch.org, "México matrimonios, 1570-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JZX6-KQY : 10 February 2018), Christoual Rodrigs. and Gertrudis Janes Y Contreras, 15 Sep 1728; citing Nochistlan,Zacatecas,Mexico, reference ; FHL microfilm 226,725.
LDS FamilySearch, "México, Zacatecas, registros parroquiales, 1605-1980," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:939N-T892-MX?cc=1804458&wc=3P9V-K68%3A147337401%2C147337402%2C153594001 : 21 May 2014), Nochistlán > Nochistlán > Entierros 1739-1771 > image 236 of 658; paróquias Católicas, Zacatecas (Catholic Church parishes, Zacatecas).
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