YOU SAID:

I have a dog, his name is River.

INTO JAPANESE

私は犬を飼っています。彼の名前はリバーです。

BACK INTO ENGLISH

I have a dog. His name is River.

INTO JAPANESE

私は犬を飼っている。名は川。

BACK INTO ENGLISH

I have a dog. The name is the river.

INTO JAPANESE

私は犬を飼っている。名称は川にちなむ。

BACK INTO ENGLISH

I have a dog. The name is named after the river.

INTO JAPANESE

私は犬を飼っている。名前は川にちなんでいる。

BACK INTO ENGLISH

I have a dog. The name is named after the river.