Means "small, little" in Thai, also used as an alternate transcription of Lao Noy. It is unisex in Thailand (more commonly used as a nickname) while it is feminine in Laos.
From Japanese 乃 (no), a possessive particle combined with 萎 (i) meaning "wither, wilt", 衣 (i) meaning "clothing", 彩 (i) meaning "colour", 水 (i) meaning "water" or 泉 (i) meaning "fountain, spring". Other kanji combinations are possible.