She supposed the old woman had told him her assumed name.

This has required him to live under an assumed name.

He had been living there for some time under an assumed name.

That was an assumed name I used for coming here.

One year later, she has moved to another school under an assumed name.

"Then what on earth are you doing here under an assumed name?"

Two days before, he had taken a hotel room under an assumed name.

And now I find out you're living under an assumed name next door to my sister.

At this time, he was living under an assumed name.

But my guess is that she's probably using an assumed name.