- Mary Kawena Pukui - Samuel Elbert, Hawaiian Dictionary, University of Hawaii Press 1971, page 389
- Hawaii State Archives: Marriage records Ku (in the old orthography) occurs in 19th century marriage records as the only name (mononym) of 13 women and 39 men.
See etymology at kū.
- Moon (the sole natural satellite of the Earth)
LĒL lists only a lower case kū for "moon," however, in this entry it is assumed that (like most other Latin script using languages) an upper case version would be used to differentiate Earth's Moon from moons any other planets might have and especially the "month" sense of the lower case version of the term.