YOU SAID:

My cat, john, is annoying.

INTO JAPANESE

私の猫は、ジョンは、迷惑です。

BACK INTO ENGLISH

My cat is annoying John.

INTO JAPANESE

私の猫は迷惑なジョン。

BACK INTO ENGLISH

My cat is an annoying John.

INTO JAPANESE

私の猫は迷惑なジョンです。

BACK INTO ENGLISH

My cat is an annoying John.