剑（jian）
Name meaning
剑 (jian) means double-edged sword, CL:口 (Kou),把 (Ba) or classifier for blows of a sword.
Practical naming use
Use 剑 (jian) when the name should suggest double-edged sword, CL:口 (Kou),把 (Ba). Keep the full two-character name natural, readable and balanced for everyday use.
Pairing guide
Pair 剑 (jian) with characters such as 安 (An) for a steadier frame, 文 (Wen) for a cultured register, 清 (Qing) for clarity or 宁 (Ning) for calm. Let the second character clarify the intended register rather than doubling an already strong image.