A highway; a twig, only in 2 Kings 12:20. If taken as a proper name (as in the LXX. and other versions), the locality is unknown.
Silla
1 verse
2 Kings
2 Kings 12:20
And his servants arose, and made a conspiracy, and slew Joash in the house of Millo, which goeth down to Silla.
From Easton's Bible Dictionary
Matthew George Easton, 1897