For [name]Kathe[/name], do you mean the two dots (umlaut) is over the a? Because that’s a recognizable [name]German[/name] name, pronounced, roughly, “KEH-teh”
Consulted my Netherlands born-and-raised hubby and he says Jasmijn would be said as yoss-mine. Our Dutch niece is actually [name]Jasmine[/name] and it’s said the American way, jazz-min. Very pretty name!