But she only had one more birdie the rest of the day (at No. 15) and had a bogey on 8 before a disastrous double-bogey on the par-4, 17th hole dropped her three shots back of Hall.
But Sunday belonged to Hall, who had her father Wayne serving as caddy.
The most recent sports headlines delivered to your inbox every morning. She was named in honor of that victory, which came after Faldo overcame a six-stroke deficit to beat Greg Norman in the final round.
After getting into golf from an early age, Hall enjoyed a successful junior and amateur career, winning several prestigious titles including the British Girl's Championship in 2012, and the British Ladies Amateur Championship at Prestwick the following year.
"I was lucky to hold the golf club", she said of her nerves at the last.
Hall shot a 5-under-par 67 in the final round to finish at 17-under 271 while becoming the fourth-youngest victor of the Women's British Open. I was loving it deep down, hitting the shots under pressure. "To get six birdies in the final round of a major is not bad".
Alison Nicholas and Dame Laura Davies are the only other English competitors to win majors.
With her win, she becomes the fourth Englishwoman to win the Championship and first since Karen Stupples in 2004.
But Hall staged a great back nine charge with three birdies in four holes from the 13th, the 25-footer at the 16th earning the lead for the first time.
The tears of joy as the 22-year-old picked up the trophy were inevitable, as the realisation sunk in that she is only the third Briton to win this tournament since it was recognised a as a major and only the fifth British female to win a major of any description. Then, when Hall rolled in a 10-foot birdie putt at No. 13, they were tied for the first time since the first hole.
While Pornanong will be singing to herself in the final round, Hall will be counting on experience. So it was kind of a battle yesterday."It's my fourth year on tour as a professional and loads of people were asking when was it (a tournament win) going to come". "I'm not allowed to show any emotion because if I show I'm happy that's not right", dad Wayne said.
"I can't believe it is true", Hall said during a television interview just moments after the victory.
The Kiwi golfer produced a blemish-free two-under 70 to sit at a tie for ninth heading into the final round. That was all he needed on a day when just about everyone within range was making all the mistakes. Ian Poulter shot 74.
It was a day that began with five players within three strokes of Pornanong Phatlum's lead. He turned in a dud, and a birdie on the 18th hole gave him another 73 to leave him 15 shots behind.
"Things could have certainly gone better", Woods said. A double-bogey 6 left Hall heading up the last with a three-shot cushion.
World No. 1 Dustin Johnson shot 64 and for third on 10-under par.
Hideki Matsuyama and Isao Aoki's runner-up finishes at the U.S. Open a year ago and in 1980, respectively, are the closest a Japanese male golfer has gotten to a major title.