The Shard's Intent can be interpreted by its Vessel and might not reflect its exact nature, definitely true. Rayse seemed to think of Odium as Passion, I think Dalinar interpreted Honor as Unity in Oathbringer, Navani interprets Honor and Cultivation's Intents from the feeling of their tone & rhythm "the boundless energy of Cultivation, always growing and changing, and the calm solidity of Honor - organized, structured. They vibrated together. Structure and nature. Knowledge and wonder. Mixing.
The song of science itself."
The name, Harmony as Sazed came to be called or chose to be called, and Discord, as Presentation predicted the combined Intent of himself & Ruin, I think are really just named after what Navani experienced with the Rhythms of the Gods and does not reflect the mixed Intent itself. The Intent might be too strange to really understand for Sazed, as of now.