Some say that he or his descendants might have changed the character '成' of his name to '重' when he was employed by Katsunari MIZUNO, in order to avoid having the same character as his lord, though it was read differently.
これは親成が水野勝成に召抱えられた際、訓みは違うものの｢成｣の字が重なることを避け、親成自身または子孫が｢重｣に改めたのではないかともいわれる。