光（guang）
Name meaning
光 (guang) means light, radiance, honor and visible brightness. In names it is direct, optimistic and historically familiar.
Practical naming use
光 (guang) gives a name a clear bright center. It suits people meant to feel open, honorable, intelligent and publicly useful. Because it is a common positive character, the explanation has to stay specific: light can mean moral visibility, intellectual clarity, family honor or a warm presence that helps others see.
Pair 光 (guang) with learning, sincerity or breadth: 光文 (Guangwen), 光明 (Guangming), 光诚 (Guangcheng) or 光远 (Guangyuan). Avoid making the full name too shiny or slogan-like.
光文 (Guangwen): Guang contributes light, honor; Wen adds culture, writing.
Reference
Qing Yun Ge
Historical / name-use references
徐光启 (Xu Guangqi)
Ming scholar-official and scientist; 光 (Guang) appears in his given name.