YOU SAID:

no in person but just his name yes

INTO JAPANESE

本人はいないが、名前だけはっきりしている

BACK INTO ENGLISH

I don't know the person, but the name is clear

INTO JAPANESE

本人はわからないが名前ははっきりしている

BACK INTO ENGLISH

I don't know who it is, but the name is clear.

INTO JAPANESE

誰なのか分からないが名前ははっきりしている。

BACK INTO ENGLISH

I don't know who it is, but the name is clear.