メイ, ミョウ, な, な, と
name, noted, distinguished, reputation
JLPT5 G1 S6 F177
夕 here a variant form of the 月 element in 明 (manifest the hidden) and serving as an abbreviated form# of the entire character + 口 mouth → state one's *name* upon being challenged (by a guard), revealing oneself → *repute*; *famous*.
[Full Kanji Etymology List]