I can't remember the last time I met a native-born American with the name "Joachim". It seems to be a given name much more popular elsewhere (e.g. Joaquin, Achim, Gioacchino, etc.) than in the USA. If I met someone named "Joachim Benno", I'd be shocked to discover they weren't German.

Most Ashkenazi Jews I know still do the religoius name/civic name thing, but I get the impression that tradition isn't as strong among Sephardim.