“请问我应该怎么称呼你呢？”英文怎么说？

How shall I address you?
How should I call you?

What name shall I say.
请问怎么称呼。
What name shall I say? =What name, please?
请问如何称呼您？
How should I style you?
我应该怎样称呼您呢？

How should I address you?

间单一点，可用：How would you like me to call you? or How do you want me to call you?

I would like to ask how should I address you?

How could I call you, please?

How may I call you?