Cher, who is worldwide famous for her four-letter name, was under the impression that she was born Cherilyn Sarkisian until her 30s, when she discovered a mistake on her birth certificate.

Cher recently revealed she was 'shocked' to learn what her real name ... went to legally change her full name to Cher in the late '70s and dropped her four surnames — her birth name Sarkisian ...

Cher recalls a curious interlude from her rich ... when she went to apply to change her legal name in 1979, she was "shocked" to discover that on her birth certificate her first name was listed ...