I don't think she knew his name.

我想妈妈不知道他的名字。

youdao

If only I knew his name!

要是我知道他的名字就好了。

youdao

If I knew his name, I would tell you.

如果我知道他的名字，我就告诉你了。

youdao

The boy only knew his name, his date of birth of June 20, 1994, and his parents' first names.

CNN: German police seek help identifying teen who lived in woods

And that's why I am so thrilled to be here in Iowa tonight -- (applause) -- because long before most people even knew his name, you all saw what I saw.

WHITEHOUSE: The White House

Recently, when I checked-in at a New York City hotel, the manager was at the reception desk and I told him (I already knew his name through my Web explorations) the reason why I had made reservations was based on several previous hotel guests positive comments on the Traveladvisor Internet site.

FORBES: Launching the "New" Customer Service 2.0 in the Age of Internet/SNS