YOU SAID:

hello i have a cat named potato

INTO JAPANESE

こんにちは、じゃがいもという猫がいます

BACK INTO ENGLISH

Hello, There are cats that potatoes

INTO JAPANESE

こんにちは、じゃがいもがある猫がいます

BACK INTO ENGLISH

Hello, There are cats there is a potato

INTO JAPANESE

こんにちは、ポテトがある猫がいます

BACK INTO ENGLISH

Hello, There are cats there is a potato