Transliterate
Transliterate["string"] attempts to transliterate string into plain ASCII.
Transliterate["string", script] attempts to transliterate string into the specified writing script.
Transliterate["string", script1 -> script2] attempts to transliterate string from script1 to script2.
Examples
Transliterate to ASCII:
Transliterate["Müller"]
(* "Muller" *)Please visit the official Wolfram Language Reference for more details.