Last name origin & meaning:
Japanese: usually written with characters meaning ‘rock well’, also
with characters meaning ‘resides in a rocky place’; the latter is the
original meaning. Mostly found in Chiba prefecture and the Tōkyō
area, it is related to the name Iwai, which has a similar
meaning. The name originated variously: in Shimotsuke (now Tochigi
prefecture), from the Utsunomiya branch of the northern
Fujiwara, who dwelt there; from a branch of the Taira
clan in Musashi (now Tōkyō and Saitama prefectures); and others.
Bearers of the name Ishii are also found in the northeast, around the
Inland Sea, and in the Ryūkyū Islands.
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