Aoyama (one of Inoue Umetsugu's frequently used actor)

While I watched the new Youtube SB video The Brain-Stealers (1968) I noticed a prominent role not listed,
but we had famous taiwanese singer in the cast credits (even he has no picture in the cast portrait side) instead
I asumed that 青山 is in that case a Japanese name, since the actor and his role seem to be japanese (even Judo-teacher)
so the role-name 大川 could be Japanese, too (and not Da Chuan as stated. Sadly Aovama is only half of the whole name
but I couldn't find further informations
https://hkmdb.com/db/people/view.mhtml? ... ay_set=eng
but we had famous taiwanese singer in the cast credits (even he has no picture in the cast portrait side) instead
I asumed that 青山 is in that case a Japanese name, since the actor and his role seem to be japanese (even Judo-teacher)
so the role-name 大川 could be Japanese, too (and not Da Chuan as stated. Sadly Aovama is only half of the whole name
but I couldn't find further informations
https://hkmdb.com/db/people/view.mhtml? ... ay_set=eng