Based on this theory, it is said that the characters of 擬宝珠 (giboshi) were later used to replace the original 葱帽子 or 葱坊主 pronouced as giboshi and indicating the head of a leek.
擬宝珠という用字は葱帽子、葱坊主に後から付けられた当て字であるとするもの。