This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The historical origin of 奆 is uncertain. It combines 大 (big) and 巨 (huge), which suggests a meaning related to great size, but the exact development is unclear.
The top 大 means big, and the bottom 巨 means huge. Together they suggest something extremely large, but the kanji itself is rare and its meaning is not fixed.
For ケン, imagine a giant named Ken who is both big (大) and huge (巨): Ken -> ケン, and his size matches the kanji's shape.