to take small steps, Korean place name
亍 centers on taking small, hesitant steps. The Korean place name usage is a separate application of the character, not a core meaning extension.
亍 is the right-hand component of 行 (go, walk), and it likely originated as a depiction of a small step or a crossroads. The exact historical development is uncertain.
The top line is a small step, and the lower 丁 shape looks like a foot pausing. Together they show someone taking tiny, careful steps.
For チョク, imagine taking small steps while holding a piece of chalk, drawing a line with each step: chalk -> チョク, and each step is small and deliberate.