Re: what do u call/name…
okay this should really come natural to him. anything you or we suggesting him wont work at all. coz whatever you call your fiance/lover should come from the heart.
2nd your friend is unromantic and you are the same. Coz even you are asking us instead of giving him direct suggestions. Really you guys are so so unromantic 
Anyways, okay since you have worked so hard and posted ur query here so… hmmm ..
Tell him to call her Sohni , she can call him Shohna ( i am enjoying even saying it ) or Sassi or hmmmmm Jaan is mostly used for boys/men. Whats her name, we will make a nick out of that.. 