pretty! (at first I pronounced it AH-vuh-nell with "a" like Adam not Ava and I didn't love it, but then I re-read it and when I said it like Ava + Nell, how I'm assuming it was supposed to be pronounced? and I liked it a lot better)
for the others I really only like Mathias, Katharina, and Malcolm, and only mildly. Myrthe is interesting! Sort of like a mashup of Myrtle and a virtue/word name "mirth"? I hope the gravestone carver didn't misspell Myrtle! LOL.