Just to remind you the Colotlan territory they use to follow the name od the day Saint calendar.

Just to remind you the Colotlan territory they use to follow the name od the day Saint calendar.

http://www.guiainfantil.com/articulos/nombres/cristianos-santos/calendario-de-nombres-de-santos-para-ninos-y-ninas-mes-a-mes/

Try finding the Saint of the name of the relative your looking and see the day that may be the day of birth or the baptism day, if you know the year it may help some