It's ironic the nickname Adolf Hitler had was also a Hebrew name (albeit with a different meaning). Anyway I like this! Not many people know this was used by Hitler anyway so it's better to use. It's short and cute, and a really good nickname!
She did, in fact! As did all of Hitler's other closest relatives. If I remember correctly, his sister Paula (1896-1960) continued to call him Adi well into adulthood, right up until her last conversation (be it verbal or written) with him before his death in April 1945.
It's short and cute, and a really good nickname!