Looking at the name in Japanese (白光), it literally translates to 'white light'. (白 is 'shiro' or the colour white, 光 is 'hikari' or light/shine/sparkle/my son's middle name)
The pronunciation of that in Japanese is Ha-Ko, said staccato with just a slight extension of the 'o' sound.
(Ha as in Hat, Ko as in Copper)