YOU SAID:

hi my last name is your mom's last name

INTO JAPANESE

こんにちは私の姓はあなたのお母さんの姓です

BACK INTO ENGLISH

Hello my last name is your mother's last name

INTO JAPANESE

こんにちは私の姓はあなたのお母さんの姓です

BACK INTO ENGLISH

Hello my last name is your mother's last name