You cannot pronounce the name regardless of whether it is written in ASCII. Pronouncing a name requires at the very least knowledge of the language it originated in, and attempts at reading it with an English pronunciation can range from incomprehensible to outright offensive.
The only way to correctly deal with a name that you are unfamiliar with the pronunciation of is to ask how it is pronounced.
You must store and operate on the person's name as is. Requiring a name modified, or modifying it automatically, is unacceptable - in many cases legal names must be represented accurately as your records might be used for e.g. tax or legal reasons later.