to heir, to rent
僦 centers on transferring possession or use: inheriting something or renting it out. Both meanings involve a person giving or receiving a right to something.
僦 combines 亻 (person) with 就, which likely contributes the sound and may relate to approaching or taking on something. The exact historical development is uncertain.
A person 亻 approaching 就 a task of passing on property: either inheriting it or renting it out.
For シュウ, imagine a person inheriting a shoe collection: shoe -> シュウ, and the person 亻 takes ownership.