Seconds after the name of Kate Middleton and Prince William's son was announced, domain names such as GeorgeAlexanderLouis.com and princegeorgecambridge.co.uk were snapped up.
The online frenzy was caused as the Duke and Duchess of Cambridge did not register an internet domain name for Prince George.
Purchases of domain names mentioning the name "George" rose by 106.9%, reseller Names.co.uk said.
One buyer of a royal baby-related domain has put it up for sale at £10,000.
The owner, Matt James, snapped up hrhprincegeorgecambridge.co.uk on 24th July - the day that Prince George's name was formally announced.
"Like most British people, I was glued to the TV, excited about the birth and thought a baby Prince domain name had potential," he told the BBC.
"If it does sell for £10,000, I will definitely give half to a charity associated with Will and Kate."
The web address www.princegeorgeofcambridge.org, the exact equivalent of the official website of Prince Harry, was bought by website designer David Henderson, of County Down, hours before the prince's name was announced.
"I'd never done anything like this before but I'd read about someone registering the previous Pope's name and selling it on for a profit so I thought I'd see what was available," Henderson told the Telegraph.
Between 22 and 25 July, Names.co.uk noted 413 individual domains that contained one or more of the words Royal, Baby, HRH, Prince, George, Alexander and or Louis.
Any royal baby-related names were purchased even before the prince was born - including royalfoetus.com which was bought in December last year.
A spokesman for Kensington Palace said: "Prince George's online presence will come under the Duke and Duchess of Cambridge's website until he is an adult, so there was no need to register a domain name just yet. We have our own suite of domain names that we are happy with."
However, the oversight could cause embarrassment for the young Prince George later on in life.