Kensington Palace said the new prince's name will be announced in "due course".
When William greeted Sir Jerry Mateparae, the New Zealand High Commissioner to the United Kingdom at Westminster Abbey, Mateparae suggested the prince name his son Jerry.
The plates and pillboxes bear the words: "Welcome to our new royal baby".
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Criminals had confused the students with members of a rival gang, authorities said, according to the Reuters news agency. The three aspiring filmmakers were students at the Universidad de Medios Audiovisuales .
The newborn is expected to have three names, according to Webber, following in the footsteps of his siblings, Prince George, 4, and Princess Charlotte, who turns 3 next week.
Even if he just can't wait to be King, the new prince is fifth in line to the throne, so it's highly unlikely he'll ever ascend.
But then William shook hands with the next man in line, whose name was Jerry, and said, "and Jerry's a strong name". The Prince once called George and Charlotte "the most incredible things ever".
Since George was the first born, his birth saw a little more fanfare from family with high profile visits from Kate's parents Carole and Michael Middleton.
Official celebrations were already under way, with the bells of Westminster Abbey ringing out from 1pm and gun salutes fired in London at 2pm.
He also joked about baby names, telling Sir Jerry Mateparae, New Zealand High Commissioner to the United Kingdom, that Jerry is "a strong name".