The Term “Christian Name” Derives from the practice of someone taking on a new name, or being given a name when they are Baptized. This practice fell out of use in most Christian societies either due to the practice of infant christening, or just choosing to not take on new names when being baptized as an older child or adult. Thus the given name not changing, or the child not even getting a given name till they are christened.
It does not have anything to do with some names being considered “Christian names” as you seem to think.
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