Joachim is my preferred spelling. It's an underused Biblical gem. I also like the Spanish version Joaquin. Some Slavic and Scandinavian countries have the Joakim spelling and it may be better for pronunciation but I still favour the original. I don't follow the NBA but I know a lot of sportsman have kre8tif spellings of names (eg. Isiah Thomas' first name should be Isaiah). :)
I suppose that depends on what pronunciation you consider correct. In Sweden, it would be spelled Joakim and be pronounced "YO-ah-keem." In the US I've heard it more like "Joe-a-kim" or "Joe-a-keem." The Joaquin spelling is more often pronounced like "Wa-keen" I believe. Do you have a pronunciation in mind?
My fam is Scandinavian so my first instinct is to pronounce it Yo-ah-keem, I personally love the name thought it may need some clarification on pronunciation and it has some very wearable nn
I'm American and I've only heard it pronounced yo-kum and he was a hockey player from Sweden