I used only to do outcalls and often ended up ringing a cab in front of the punter. When they asked for a name the first tyme I said Nova. At first the cab driver wouldn't let me in as he was expecting a bloke - they told him 'Noah.'
From then on I just made up a name spontaneously - always with the next letter of the alphabet so Anna, then Bridget, Charlotte, Debbie, Emily etc. I felt bad when some punters had a little glow of pride at apparently discovering my real name.