Rain

Rain is a direct English nature name taken from the word for water falling from clouds. That simple meaning is clearer than assigning it a place-name derivation borrowed from a similar surname. As a given name, it can evoke weather, renewal, a favorite landscape, or a personal memory, depending on the family's connection.

The one-syllable form works for boys and girls and is easy to recognize in writing. Raine and Rainn offer alternative spellings, while Reign sounds the same in many accents but has a different meaning connected with ruling. Parents who want the natural reference to be unmistakable may prefer Rain's ordinary word spelling. Its brevity also makes it a flexible middle name beside a longer first name.