Purely on the intial we wanted started with that and went from there. As middle name is so rarely used wasnt that fussed with name just had to have right intial. DD we wanted CJ - so that dictated first and middle we found the C but for the J couldn't come up with anything so like in the Simpsons apparently we went with Jay for the J. DS once had first name I wanted initials SAM (have always had a thing about intials being names) - so looked for A names that went ok and picked my Grandad name Arthur. If DD first didn't suit her so well I might have regrets because no one here knows how to say it and I had not appreciated that fact - but matters less with middle names.