“You could give them any middle name and last name you wished but their first name had to be English.”
A page from the Hawaii birth index would appear to show this statement to be correct, with very few exceptions:
https://myveryownpointofview.files.wordpress.com/2011/03/ptdc0028.jpg
It’s not something that I was aware of, either. The exceptions on that page are:
KAM. LUSI. BRAULIO.
It has been so long since I looked it up that I don't remember what the exceptions were.