county in Shaanxi province
鄠 is a rare kanji used primarily as a proper noun for a county in Shaanxi province. Its standalone meaning is tied to that place name and has no broader conceptual center.
鄠 combines the village component ⻏ with 雩, which likely served as a phonetic element. The character was created as a place name and its historical development beyond that is uncertain.
The left side 雩 suggests rain (雨) over a shape, and the right side ⻏ is a village. Picture a rainy village in Shaanxi named 鄠.
For コ, imagine a small child (子, こ) pointing at the rainy village on a map: こ -> コ, and the child says the county name.
—