how to make some names faction exclusive? like i want this name "Toyohisa"that was listed as names_japanese and i want to make it exclusive for the Shimazu.

do i just change the names_japanese to names_shimazu or should i clone that row before i make the change and delete the original one?

[names_japanese] [Toyohisa] [forename] [m] [01 00 00 00 00] [2147314458]