I never remember actor names unless they are of the ridiculously famous type, but it turns out I have seen a few films of his.
Same with me, honestly, and when I DO remember a particular actor, it's often not by that actor's own name, but by whatever role that actor played left the most impression on me, usually the first role of that actor that I really noticed. There's still a lot of actors I tend to refer to by the names of a character they've played rather than their actual names.
But anyway, I have no real idea of Max Von Sydow is, as long as he can be a good voice actor and fits the part he is given, though, I don't really need to know him. I don't need to recognize actors, whether for voice acting or live action performances, to appreciate them, if their performance is good, that's enough for me.