The outer square (囗, a variant of 囲) suggests an **enclosure** or **circle**, while the inner shape (己) marks the **boundary** or what's **within** that circle. Together, they define a **sphere** or **range**.
'Ken' — Imagine 'KEN' (the inner part, 己, slightly resembling K-E-N) standing inside his personal **sphere** or **range** of influence, denoted by the surrounding enclosure.