What to do when your best friend wants to use your baby names?

I have been planning baby names, a few boys and a few girls names for when me and my husband of 6 yrs have baby number 2 and my friend has had a short 'courtship' and is getting married soon and thinking up baby names and a as for girl names there are no similarities but boy names she has my choices whether it be used as a first or middle name. I am frustrated cuz i have had these names for a while and love them. How do i stear her away from my names without getting rude?