先（xian）
Name meaning
先 (Xian) carries being first, going ahead and taking responsibility before others do. In a name it suggests initiative, precedence and a serious public-minded temperament.
Practical naming use
先 (Xian) is useful when a name needs first, earlier, leading rather than a generic pleasant sound. Its register is classic, public, so it can support a boy name that feels culturally legible, visually compact and easy to explain. The character should be paired with a second character that gives the image a human scene: learning, calm action, public responsibility, graceful movement or long-range aspiration.
Pair 先 (Xian) with characters that soften or complete its core image. Bright partners make it more optimistic; scholarly partners make it more literate; water or nature partners make it calmer; virtue partners make it more formal.
先安 (Xianan): Xian contributes first, earlier; An adds peace, safety.
Reference
Fan Zhongyan · Yueyang Lou Ji
Historical / name-use references
先轸 (Xian Zhen)
Xian Zhen was a Jin general of the Spring and Autumn period. His name directly contains the target character, giving it a strong pre-Qin historical anchor.