proper name
This rare kanji is used as a proper name. Its standalone meaning is unclear.
The exact historical development of 汳 is uncertain. It visually combines 氵 (water) with 反, but the original semantic or phonetic role is unclear.
Since 汳 is a proper name, picture a unique water-side sign with 氵 and 反 marking a place called 'Han' or 'Ben'.
For ヘン, imagine a hen standing by the water (氵) near a sign that reads 反: hen -> ヘン, and the hen guards the proper name place.
—