This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
侉 is a rare character composed of 亻 (person) and 夸. The exact historical development is uncertain, and it may have been used as a variant or for a specific name.
A person 亻 beside 夸, a shape that suggests boasting or exaggeration. Without a clear meaning, picture a person whose role is uncertain, perhaps a braggart or someone proud.
For カ, imagine a person 亻 making a boastful claim that sounds like 'ka!' — a short, sharp exclamation. The sound 'ka' cues カ, and the person's proud stance fits the uncertain meaning.