I know a Linus and Silas who are half German. They are used to having it pronounced the English way in school/ friends and German way by parents/ grandparent/ aunts/ uncles/ cousins. I think it works in all Euro languages?
Still love David though (but it is my Dad's name so couldn't use it on ds2, as ILs would have not been happy). If you love a name, no need to not use it because you know someone. I do like Nathaniel but see it as more religious than Matthias, maybe because Matthias is not a common name in English bible (it is Matthew), though I think there is a mention of one, possibly, like Linus). I like Joel a lot too.