My family came from the part of Mayo that the film was shot in. Every family from that part of the world seems to have a 'Quiet Man' story. For what it's worth, here's mine.

My aunt was working in a shoe shop in Cong. Who walks in one day but the Duke himself. He went up to my aunt and said he had a pair of shoes that needed repairing. She looked at them, wrote the order down in the book and told him when they'd be ready. 'Thank you, ma'am' says the Duke. 'You're welcome', says my aunt.

'...And the name?'

Later, she told me 'I knew very well who he was but I didn't want to give him the satisfaction.'