Meaning of the surname *CHRISTAL*
The Book of Irish Names, First Family & Place Names has Chrystal listed as a form of Christopher. Surnames: What's In A Name? also mentions Chrystal as a variation of Cristal.
A Scottish patronymic name derived from Christopher (bearer of Christ). Other variations are Crystall, Chrystall, Crystol, Kristall. Family Education has Christal as Scottish variant of Chrystal; Americanized spelling of German Christel or Kristal.