What a cool name! I’ve never heard it before, but I really like how it sounds.
Dymi is also my favorite nickname of the ones you have listed.
What about:
[name_m]Enzo[/name_m] (probably my favorite!)
Dyo/Dio
Myo/Mio
[name_f]Emmy[/name_f]
[name_m]Eddy[/name_m] (unsure since it’s pretty similar to Ned/Teddy tho)