Obi-Wan
He was very traditional and liked calling you pet names such as 'sweetheart', and 'darling', whether that be in a friendly way or not.
You, on the other hand, nicknamed Obi-Wan 'love'. It was a name you'd picked up from your parents, as they were constantly calling each other it. You felt it expressed your feelings towards Ben in many ways, including your solid, friend-like bond and the emotional connection you both felt.
Anakin Skywalker
He never even had to think about it before he started calling you 'beautiful', almost as if it were your name. Anakin was surprised when you were caught off guard when he first said it, for he thought it was insane that a woman with such beauty had never realised just how perfect she was.
Returning the favour, you always called Anakin 'handsome'.
Luke Skywalker
The name he'd come up with was 'angel'. Not very original, but he claimed that it described both your appearance and your personality, so you went with it.
You called Luke 'cutie,' for you thought he was so adorable that you couldn't resist giving him a childish, although cute, pet name.
Han Solo
He'd called you 'stunner'. For one, when he first met you, he'd been distracted and said that you were the 'most stunning girl he's ever met,' and, after a while of missions together, he'd been visibly stunned to silence when he saw you take out a group of Stormtroopers by yourself. The name just kind of stuck.
'Loverboy' was your name for Han. He was the typical guy all girls would swoon over though he swore that no matter how much attention he got, he would only ever have eyes for you.