Where did the name Rainbow come from?

It is a colorful bow made from sunlight and the moisture in the air before, during or after rain. It's an arch, but the word arch didn't fit as a whole word with rain, so the word bow was used instead. Rainarch does not fit well so rainbow was used in place of it. A rainbow is an arch of the color of light that is created when it rains. It's created with rain and light. The rainbow got its colors because when the rainbow appears after a shower, we see them again. These beautiful flowers of many colors in the sky. The rainbow is the flowers "land of the here-after".