name of a state, surname
鄹 is a rare kanji used primarily as a proper noun: the name of an ancient Chinese state and a surname. Its standalone meaning is tied to these historical and family-name uses.
鄹 combines 聚 (gather, assemble) with the city enclosure ⻏, suggesting a place name. The exact historical development is uncertain, but it likely originated as a toponym.
The left side 聚 suggests gathering, and the right side ⻏ marks a city. Picture a gathering place that became a named state, and later a family name.
For シュウ, imagine the ancient state's people gathering to shout 'shoo!' as a cheer: shoo -> シュウ, tying the gathering 聚 to the reading.
—