明古鲁 Origin — Dong Chinese Dictionary

míng, ming bright

The character was originally depicted moonlight (月) shining through a window (囧). The 囧 component was later reanalyzed as 日 (sun).

Components

囧 Sound Iconic component

jiǒng bright window

The modern form looks similar to 日 (sun).

Change in sound

明 and 囧 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
明 *mraŋ
囧 *k-mraŋʔ (dialect: *k.mr- > *kʷr-)

Change in form

Due to historical stylistic changes, this component is less similar to 囧 than it was in ancient scripts.

月 Iconic component

yuè, yue moon

Character Evolution

Bronze form — Bronze Early Western Zhou ~1000 BC

Seal form — Seal Warring States (Chu) 475-221 BC

Regular Modern

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Component uses

Sound (0 of 2 verified)

盟萌

Historical Pronunciations

	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	mjaeng	mraŋ	bright

說文解字

《說文》：“朙，照也。从月，从囧。明，古文朙，从日。”

Sources

Character origin: 季旭昇《說文新證》p.551-552漢語多功能字庫
Readings & variants: Unicode
Historical pronunciations: Baxter-Sagart
Historical images: Academia Sinica
Etymology: Shuowen Jiezi (說文解字)

gǔ old

Original meaning: firm, solid

Depicts a shield. Based on the original meaning "firm, solid", which is now written as 固. The current meaning "old" is a phonetic loan.

Components

盾 Iconic component

dùn shield

Depicts a shield.

Change in form

Due to historical stylistic changes, this component is less similar to 盾 than it was in ancient scripts.

口 Meaning component

kǒu, kou mouth

The 口 component is sometimes used to indicate an abstract meaning taken from a concrete object. Here, the concrete object "shield" evokes the abstract meaning "firm, solid".