Ralph H. Koga 79, of Waialua, HI, died in Waialua on February 26, 2021. He was born in Waialua, Oahu, HI. Private services SHARE ON FACEBOOK SHARE VIA EMAIL Our deepest condolences to the family and friends of the deceased ADVERTISEMENT Explore more Search Records for Ralph H. Koga with Ancestry® Discover Ralph H. Koga Family Story with Ancestry® AncestryDNA® with Traits Discover Details of Your Family History - Search Records with Ancestry® Sponsored by Ancestry