Ask something

You can say 「Have you ever heard of a person named　～？」when you want to ask somebody knows that person or not.

For example,「Have you ever heard of a person named Oshiritantei?」

You can also say「Have you ever heard of a sweet named Unagipie?」.

（I always buy Unagipie when I go to Nagoya)

You can say not to use 「Do you know ~?」.