興
コウ, キョウ, おこ.る, おこ.す, おき, おこっ, とも
entertain, revive, retrieve, interest, pleasure
JLPT1 G5 S16 F734
The relevant seal inscription form combines 同 same + 與# (raise in unison) → work together to *raise*, *build* or *promote* → *interest*; *prosperity* (← raise interest; build up funds). *Prevalent* is an extended meaning.
[Full Kanji Etymology List]