The name "Harley" is not exclusive to pugs, and people choose it as a name for their pets for various reasons. However, there might be a few factors that contribute to the popularity of the name "Harley" specifically for pugs:
Resemblance to the Harley-Davidson logo: Pugs are known for their distinctive wrinkled face and a compact, muscular body. Some people believe that their wrinkled forehead resembles the front fairing of a Harley-Davidson motorcycle. As a result, they may choose to name their pug "Harley" as a playful reference to this resemblance.
Harley as a tough or rebellious name: The name "Harley" can evoke a sense of strength and toughness, which some people find endearing for their pug. Despite their small size, pugs are often known for their spirited personalities, so the name "Harley" may be seen as fitting for a confident and feisty pug.
Pop culture influence: Pop culture references can also contribute to the popularity of certain pet names. The name "Harley" may have gained some popularity due to the character Harley Quinn from DC Comics, who has appeared in movies like "Suicide Squad" and "Birds of Prey." The association with a strong, independent female character might have influenced some people to choose the name "Harley" for their pugs.
Ultimately, the choice of pet names, including "Harley" for pugs, is subjective and can vary from person to person. Some individuals simply like the sound of the name or have a personal connection to it, regardless of any specific association or trend.