List of a specific Christian name

Geoff Johnson

I want to find out where a specific Christian name crops-up in a project.  I can see them fairly easily within a specific surname group, but females can marry and pass-on specific family names with their new surname.  FH display a Name in one lump, but I note when I'm creating a new one, it seems to that forward slashes are displayed momentarily.  Are the names held in a split-up format somewhere?
My objective is to find out when a long-used family name first came into use.
Regards to all.

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