Contrary to the view of 'shinsei' (bestowing a surname) and 'granted' in the family names of TOYOTOMI and HASHIBA, Kenichi NIKI guessed that it had been the custom of the territorial lords to write 'the family name of HASHIBA' in an official manner at that time.
二木謙一は、豊臣・羽柴の「賜姓」「授けられた」といった見方に対し、諸大名は公式には「羽柴姓」を記すことが当時の慣例であったとの推測を述べている。