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What 成 means in a Chinese namechéng

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成chéng · B
tier B

完成、成为;引申为成就。

To complete, to become — and so achievement.

1 处原典 · 1 部典籍 · 全部可核

斐然成章 Formed, not yet finished

吾党之小子狂简,斐然成章,不知所以裁之。

The young men of my home village are ardent and ambitious; their writing has real form — they just do not yet know how to cut it.

论语 · 公冶长篇 · our translation
They have form but not finish. 成 in a name is having taken shape, not having arrived. 「成章」是已经有了文采与章法,但还没裁到定。名字用「成」,取的是「长成了形」这一层。
成章玉成成之成器玉成成蹊
In a name

Having taken shape, not having arrived.

「成」是长成了形,不是到了终点。