A question about a name

I am editing a symphony by a Austrian 18th century composer named Carl von Ordoñez? But I unsure how you correctly say his name (the tilde "n" that is giving me a hard time). Right now I'm saying "or-DON-ez." I'm also unsure if the first name is Karlos or Carlos (since in German, aren't all "C"s changed over to "K" automatically?

Thanks.