Welcome HRH Prince George Alexander Louis of Cambridge! Here’s an abbreviated history of his name below, but there’s more to his name, as well as the Duke and Duchess of Cambridge’s names, on the OUPblog. 
George: M. Via Old French and Latin from Greek Georgios. The Greek name is a derivative of geo¯rgos ‘farmer’, from ge¯ ‘earth’ + ergein ‘to work’.
Alexander: M. From the Latin form of the Greek name Alexandros ‘defender of men’. Its use as a Christian name was sanctioned by the fact that it was borne by several characters in the New Testament and some early Christian saints.
Louis: M. French name, of Germanic (Frankish) origin, from hlud ‘fame’ + wı¯g ‘warrior’ (modern German Ludwig). It was very common in French royal and noble families. 
Image credit:The Duke and Duchess of Cambridge on the balcony of Buckingham Palace, June 2013, by Carfax2. Creative Commons license via Wikimedia Commons.

Welcome HRH Prince George Alexander Louis of Cambridge! Here’s an abbreviated history of his name below, but there’s more to his name, as well as the Duke and Duchess of Cambridge’s names, on the OUPblog

George: M. Via Old French and Latin from Greek Georgios. The Greek name is a derivative of geo¯rgos ‘farmer’, from ge¯ ‘earth’ + ergein ‘to work’.

Alexander: M. From the Latin form of the Greek name Alexandros ‘defender of men’. Its use as a Christian name was sanctioned by the fact that it was borne by several characters in the New Testament and some early Christian saints.

Louis: M. French name, of Germanic (Frankish) origin, from hlud ‘fame’ + wı¯g ‘warrior’ (modern German Ludwig). It was very common in French royal and noble families. 

Image credit:The Duke and Duchess of Cambridge on the balcony of Buckingham Palace, June 2013, by Carfax2. Creative Commons license via Wikimedia Commons.