Chrystal

The meaning is pure. It is pure Christ like in the Bible. The h left in goes all the way back to Greek then to German history. My grandmother's name was Chrystal and it was given to a person in my family as well way before she was deceased. The h was left in because this is the way it was spelled from the ancestors, somewhere in history people started dropping the h therefore the h was dropped out but in the beginning this name began with the h.

This version of Crystal is usually a family name, the extra "h" as you put it is a thing of tradition or respect for an elder/diseased relative.