Genealogy experts expect William and Kate's wedding will boost marriage rates in Britain, as was the case in 1947 with Queen Elizabeth and Prince Philip. Nuptials jumped 35 percent that year.
"Analysis of historic marriage records reveals that today isn't the first time royal wedding fever has gripped the nation, with regal nuptials influencing marriage rates throughout the 20th century," said Harman.
The four other biggest spikes in matrimony occurred in 1973 with the wedding of Princess Anne to Mark Philips (34 percent); King Edward VIII and Wallis Simpson in 1937 (20 percent); Prince Rainier and Grace Kelly in 1956 (18 percent) and Prince Charles and Diana Spencer in 1981 (18 percent).
Here's some tips for searching your royal roots:
Cross-reference surnames in your family tree with those found in Burke's Commoners and Landed Gentry of Great Britain.
Also, seek out relatives who may have been wealthy and look for towns where family may have emigrated from or had land. Seek out titles as listed in the census.
If your family is Norman -- the French from Normandy who invaded Britain in the mid-1000s under William the Conqueror -- you most likely had royal connections.