Is using the same topic title as a book title plagiarizing?
There are no official policies on things not being allowed to have the same name.

It doesn't seem to be a legal problem: How many books are called Algebra? and how many songs are called I love you? How many companies have been called Smith and sons?)

It is not a technical problem since title is not the most relevant citation information

Is it an ethical problem? I don't think so.

Still, if the other book is well known, it can lead to confusion and people can think that you are a bit bizzare to reuse the title. I wouldn't do it.