I get this question a lot it might even be out ranking the “why do you have Pink hair” question.
Now remember all these tips are from an English girl who will probably never get it 100% correct but I guess some instruction is better than calling him Why-me 😉
First of all the name is Dutch, not sure if that makes any difference but I add that bit of useless info for you anyway LOL
If you are Afrikaans or can read Afrikaans it is said like the Afrikaans word for Germs – Kieme without the K
If you are not South African chances are that does not help. So lets try phonetics.
‘I’ like in the word India then ‘muh’
Not sure if that helped at all and I am sure the man will have a better explanation but this is the best I can do