Well, they are obviously matchy due to their ending sound. But, the real question is does that bother you? It has a cutesy sound but aren't little kids cute by definition? :)
I personally don't put much stock in middle names or sibset names in regards to adulthood. How often do you think about your co-workers or neighbors middle names or their siblings names? We're just focused on it right now, but in normal everyday life I just don't think it's a huge deal.
ETA: I do, however, think initials are a big deal in adulthood. My husband hated his, FAG.