Joanne vs Joanna - What's the difference?

As a proper noun joanne

is , a spelling variant of joanne.

* JoAnne, Jo-Anne, Jo Anne * Joann, JoAnn, Jo-Ann, Jo Ann

(en proper noun)

* 1824 , The History of Matthew Wald , E. Duyckinck, Collins & Hannay, page 112:

"I have," said I; "and I have seen the young ladies too, except Miss Joanne ."

"Ye may just as weel lay by the Miss, and ca' her Joan, like her mother afore her, noo -

* 1981 , Bodily Harm , Anchor Books, ISBN 0385491077, page 16:

She changed it when she was thirty-eight because, as she said, what can you do with a name like Joanne ? Too nice.

(en noun)

(Cockney rhyming slang) A piano.

* 2006 , "

But I don't feel like dancin'

When the old Joanna plays

My heart could take a chance

But my two feet can't find a way