Julia Koo was born 28 March 1851 in Honaunau-Napoopoo, Hawaii, United States to Henry Koo (1820-1916) and Rebecca Lipeka Kapahunui (1827-1903) and died 8 January 1924 Honolulu, Hawaii, United States of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| Lucinda Kunia Kinia Wright (1888-1952) | 17 March 1888 Hilo, Hawaii, United States | 3 March 1952 Nānākuli, Hawaii, United States | David Kawaihalau Namakeha Kaeo (1886-1965) |
Siblings
| Name | Birth | Death | Joined with |
| Julia Kailani Koo (1851-1924) | 28 March 1851 Honaunau-Napoopoo, Hawaii, United States | 8 January 1924 Honolulu, Hawaii, United States | Thomas Harris Wright (1856-1902) |