to give one's name (as); to introduce oneself (as)
to claim to be; to call oneself; to wear the title of
to reveal oneself (as); to admit to being
to adopt as one's name; to take (a name)
彼は自ら名乗り出て責任を取った。
He came forward and took responsibility.
電話では最初に名前を名乗るのが礼儀だ。
It is polite to give your name first when making a phone call.
見知らぬ男が記者だと名乗った。
A stranger identified himself as a reporter.