My sisters were huge
Bee Gees fans back in the 1970s and
Maurice was their favorite
Bee Gee. They gave me to understand that MAWR-is was the go-to pronunciation for
Maurice in both Australia and the UK and that's why
Maurice Gibb's name was pronounced that way.
Anyway, I'd have to make a real effort to say MAWR-is if I saw it as
Maurice. I prefer the MAW-REES pronunciation because that's what comes naturally to me.