I'm not big on alliterative combos, but
Edgar Elliott is far from awful. I'm not in love with
Edgar, but I adore
Elliott. I'd be terribly happy to meet a little
Edgar, though. :b But I just think I see it and realize I love other
Ed- names more, like
Edmund,
Edward (though I do like
Edgar between than
Edwin, I think).
As for your other names,
Emily,
Sarah &
Christopher stick out as being so overused, classic, and popular, while
Rilla,
Noam and
Edgar seem to go together better.