Nectaire is probably of the same derivation as the English word "nectar". This is the etymology of "nectar" (from
http://www.etymonline.com/)
"1555, from L.
nectar "drink of the gods," from Gk.
nektar, which is said to be a compound of
nek- "death" (see necro-) + -
tar "overcoming." Meaning "sweet liquid in flowers" first recorded 1609".
Hope that helps :-)
♦ Chrisell ♦