county in Hunan province, surname
郴 is a proper noun used as a place name (a county in Hunan) and a surname. It has no common standalone meaning beyond these specific references.
郴 combines 林 (forest) with the city/walled-town component ⻏. It likely originated as a place name referring to a settlement near a forest, but the exact historical development is uncertain.
Picture a forest 林 beside a walled town ⻏: this is the forest-town of 郴, a specific place in Hunan.
For チン, imagine the forest-town's name is Chin, pronounced like 'chin' in English: Chin -> チン, the county in Hunan.
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