One option is Molniya, the Russian word for "lightning." The Molniya orbit may share the same origin.
Mollitia (mo-LEE-sha) is another option, which is Latin for "tenderness."
Magnolia is a much more common name with Molly/Mollie as a nickname.
On the surname side there is Mollineau (moll-in-oh).
On the nature side you can find Moschatel (mos-sha-tell) or Moschatella.
And if you don't like these but want the nickname to sound similar, try Amalia with the nickname Mali.