After that Naomasa lost his family name Ii, and renamed himself Toramatsu MATSUSHITA because his real mother had married Kiyokage MATSUSHITA, a vassal of the Imagawa clan.
その後、直政の生母が今川氏の家臣である松下清景と再婚したため、直政は井伊の姓を失い、松下虎松と名乗るようになる。