personal name, servant
傒 centers on a person in a subordinate role: a servant or an attendant. The personal name usage likely derives from this servant idea.
傒 combines the person radical 亻 with 奚, which likely contributes the sound and may relate to the idea of a servant or attendant. The exact historical development is uncertain.
A person 亻 beside 奚, a shape that suggests a tied or bound figure. Imagine a servant bound to their duties, always at the ready.
For ケイ, picture a servant carrying a heavy tray and saying 'Kay!' as they struggle: Kay -> ケイ, the sound of a weary attendant.