I know in every language there are a lot of ways and cute names to address your girlfriend or your boyfriend to show you love her/him. The names can be creative for any couple. As Andy mentions these names are called terms of endearment.
These are some very ordinary I know for examples:
Come here, sweetheart.
Relax baby, we're on holiday!
Look, darling, there's Mary.
What else can be used to address your girlfriend/boyfriend?