Strange... "el" probably means "God" in my opinion, like
Nathaniel is God's gift... But maybe not, like
Rachel...
Prince in Hebrew can be Sar, Nasi... Look here for words meaning "prince" in Hebrew:
http://beta.studylight.org/enc/isb/view.cgi?number=T7090I would really like to know more about it if someone know!
Sidelle reminds me of a feminine form of
Sidney. This website seems to agree with me:
http://www.aussiethings.com.au/babynames/sgirl.htm
Ooooh, look here!
http://www.behindthename.com/bb/arcview.php?id=32702&board=gen