Pk70, amarsanghera, jios!

How does a convert change from a Western name. Is baptism the only way? Or may I start referring to myself as "kaur" right now? One of those puzzles and I never get the same answer when I ask the question.

__________________
ਮਨ ਕਰਹਲਾ ਗੁਰ ਗੋਵਿੰਦੁ ਸਮਾਲਿ ॥ man karehalaa gur govindh samaal O camel-like mind, dwell upon the Guru and the Lord of the Universe.