well thanks for the tips, unfortunately :

MorphOS - L'OS foudroyant (yeah you can use OS in french, SO isn't used at all)
or - MorphOS - L'OS fulgurant

all of these sounds a bit dumb, like a 60's superhero name or something. But the "coup de foudre" idea isn't bad at all..

MorphOS - l'OS "coup de foudre"

why not... sounds a bit too romantic though...