YOU SAID:

I have a cat named jeff he is the best

INTO JAPANESE

私はジェフという猫を飼っています

BACK INTO ENGLISH

I have a cat named Jeff

INTO JAPANESE

ジェフという猫がいます

BACK INTO ENGLISH

There is a cat named Jeff

INTO JAPANESE

ジェフという猫がいます

BACK INTO ENGLISH

There is a cat named Jeff