I'm going to treat customers with foreign sounding names different than others
Have you done this before?
Do I have to repeat the same thing over and over again? Of course of have. I do it a lot.
You should treat people equally and not judge them if you never met them. It is unfair if people face obstacles over stereotypes.
No one knows so why are you trying to make a big deal out of it?
It would be better to treat everyone the same. If you do this people will find you more trustworthy.