What does ka mean in Hawaiian?
Ka is the definite article, the, and it begins hundreds of Hawaiian names. Kalani is the heavens, Kealoha the loved one, Kanoe the mist. Before words that start with k, e, a, or o the article becomes ke, which is why it is Kekoa and Keola but Kalani and Kanani. A name beginning with ka or ke points to one particular thing: not a sky but the sky.
Say it KAH. Every vowel is pronounced, and the capitalized syllable takes the stress. The pronunciation guide covers the rules.