don't know about that... but how about some stones? Charles Michael Ronald could all work being both royal and family names but keith not so much.
I would say go with the Charles Michael Ronald as a second child's name (I would include the Keith as well, just for continuity's sake). It seems to honour Catherine's family more than William's - which is totally appropriate, but somehow I can't help but feel that the first child, and the heir, should be more Royal in its name than Middleton.
you are right... the john negates the whole thing. shoot. but seriously, a baby john is highly unlikely to die young now which is the main reason john is a no go. seems silly to me.
The thing with John is more than just a couple Prince Johns dying young. The overall history of the name Prince Johns of England (or therabouts) has almost always been bad.
The first English royal John was John of England. He's known for the Magna Carta (which he didn't willingly sign) and being a villain in the Robin Hood stories.
The second John was John of Eltham, Earl of Cornwall, son of Edward II. He died at age 20.
The third John was John of Gaunt, 1st Duke of Lancaster, third son of Edward III. Overall he was actually pretty successful in life, lived until he was 58, and had several children. It was his eldest son, the future Henry IV, who started the War of the Roses, and later it was one of his descendants, Henry VII, who ended it.
The next John was John of Lancaster, 1st Duke of Bedford, and son of Henry IV. While he lived to age 46 and even acted as regent for his nephew, Henry VI, he died without legitimate surviving issue.
The fifth John is John of Gloucester, who was the illegitimate son of Richard III. It's believed that he was executed during the reign of Henry VII.
The sixth John is Prince John Alexander of Wales, youngest child of Edward VII and the only one to not live past a couple days.
The final John is Prince John of the United Kingdom, who was epileptic, hidden from the public eye, and died at age 13.
There's also John Balliol, King of Scots, who is best known for abdicating the throne in favour of the English Edward I. From his abdication to the accension of Robert the Bruce 10 years later there was no Scottish monarch. He was so hated that nearly 100 years after his reign when another John came to the throne he changed his name to Robert (III) so as to not be associated with the previous John.