The survey showed Prince Harry as the most relatable royal overall, gaining 32 per cent of the votes, with Markle coming in second at 29 per cent.
In 2016, Harry and Markle were introduced by a mutual friend on a blind date and began dating; in November 2017, they announced their engagement.
Friends of Markle's who reportedly attended the bridal event, which took place at the exclusive member's club, included Lindsay Jill Roth, Heather Dorak and the actress' mother, Doria Radlan.
The one-time "Suits" star was raised as an Episcopalian, but was enrolled in Catholic schools in Los Angeles throughout her childhood.
The source also confirmed that her baptism will be performed by Archbishop of Canterbury Justin Welby, who is also set to officiate their wedding.
Prince Harry and Meghan Markle at an appearance last week. Kensington Palace
The wedding of the year is just a few months away. "Meghan, on the other hand, grew up in Hollywood (her dad was a cinematographer) and works in an industry where your job is to stand out".
But according to Paul Burrell, Kate and William's new baby, and Harry and William's cousin Zara Tindall's second child which is due later this year, won't be the only two royal babies making headlines this year.
Since Harry's very famous grandmother, Queen Elizabeth, holds the official religious role of Supreme Governor of the Church of England, it is necessary for Meghan to be baptised before she says "I do" with Harry.
Several male members of the royal family don't.
"This is no tick-box exercise for them, 'Oh we ought to get married in a church, '" he said past year.
In addition, 200 people who work for charities and organizations with which Prince Harry and Markle have close associations will also attend.