This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
頵 combines 君 (lord, ruler) with 頁 (head, page). The exact historical development is uncertain, but it likely relates to a large head or imposing appearance, consistent with the kun reading おお.きい (large).
The left side 君 suggests a ruler, and the right side 頁 suggests a head. Imagine a ruler with an unusually large head, making them stand out.
For イン, picture an inn where a large-headed ruler stays: inn -> イン, and the innkeeper remembers the guest's imposing head.