This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
侒 combines 亻 (person) with 安, which likely contributes the sound. The exact historical development is uncertain.
A person 亻 beside 安 (peace) suggests a peaceful person, but the actual meaning is uncertain.
For アン, imagine a peaceful person named Ann: Ann -> アン, and she stands calmly beside the 安 component.