Here are a few options, depending on what you want to convey:
* "Imi" - This is the closest sound, but it means "to seek" or "to search for" in Hawaiian. It could be an interesting choice if you want a name with a similar sound but different meaning.
* "Kimi" - This means "your" or "yours" and sounds similar to Jim.
* "Iema" - This is a common Hawaiian name that sounds somewhat similar to Jim.
Ultimately, the best way to say "Jim" in Hawaiian would be to use the closest approximation based on the sound. It's also possible to create a unique Hawaiian name for Jim that captures his personality or essence.