I pronounce it so the first syllable sounds like ROHN, not
RON. With a long O. I don't like
Ronnie either, but I kind of like
Roni.
Ronia is ROHN-ya, but I'm not sure about Roniah. I guess it's roe-NEE-ah or roe-NY-ah. There were also some girls named Ronya and some named Roniya.