It’s Always Sunny’s McPoyle Brothers Were Inspired By A Real-Life Guy
By SHAE SENNETT
The McPoyle brothers from "It's Always Sunny in Philadelphia" found their inspiration in a real person known to one of the series co-creators, Charlie Day, during his college days.
Brendan McPoyle, having no resemblance to the characters, had a name that Day found amusing, as revealed by Day on LAist, stating, “I just always thought it was a funny name.”
According to Day, “Jimmi Simpson and Nate Mooney, [...] who play Ryan and Liam McPoyle, are good friends of mine from way back when,” and they were eager to be part of the show.