Soun's place of birth remained unknown for a long time and some of the most accepted theories were that he came from Ariwara in Yamato Province, Uji in Yamashiro Province, Ise, Kyoto or Bitchu.
早雲の出自については長年明らかにならず、主なものに、大和国在原説、山城国宇治説、伊勢説、京都説、備中説があった。