This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
奫 combines 大 (big) with 淵 (abyss, deep pool). The exact historical development is uncertain, but it likely relates to a large or deep body of water.
The top 大 suggests something big, and the bottom 淵 is a deep pool. Picture a vast, deep abyss of water, but remember the kanji's meaning is unclear.
For イン, imagine an inn built beside a deep, mysterious pool: inn -> イン, and the pool is as big and deep as the kanji suggests.