This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
慻 combines 忄 (heart) with 眷, which likely contributes the sound. The exact historical development is uncertain.
The heart radical 忄 beside 眷 suggests an emotion or mental state, but the specific meaning is unclear.
For ケン, imagine a person named Ken looking back with a concerned heart: Ken -> ケン, and the heart radical 忄 shows his feeling.