Joshua and
Jocelyn are very close in sound, too close for brother and sister for my tastes. I love both of them very much and even though they don't have the same meaning or come from the same origin but they sound very much alike. Both names can also have the nn
Josh (or Joce /
Joss) so they are rather alike.
Some of my favorite J names for girls are:
JuliaJulietJulianaJulieJadaJane /
JayneJayna / Jaina
JennaJennyJoannaJeanne /
JeannaJinnyJuneJillianJemmaJessamineJosephineJolieJessaJoyJoyceJoyanna
Hope this helps!
Laurie :)