What is the meaning of Siena?

sienna (pigment, color)

genitive singular of siens

wall (structure (made of wood, masonry, etc.) that limits a building, a room, etc.)

wall, rampart (a high enclosure, especially for protection)

something that encloses, also metaphorically

external side of a container, box, cavity, body organ, etc.

wall

border, boundary

obsolete spelling of sjena

Source: wiktionary.org