compare, spy on
俔 centers on observing someone closely, either to compare them to something else or to spy on them secretly.
俔 combines 亻 (person) with 見 (see), suggesting a person who watches or observes. The exact historical development is uncertain, but the component structure is clear.
A person 亻 using their eyes 見 to watch someone closely, either to compare them or to spy on them.
For ケン, imagine a person named Ken who is always comparing things and spying on others: Ken -> ケン.