The fictional Welsh Quidditch team supported by Ginny Weasley is the Holyhead Harpies.
The Holyhead Harpies are a professional women’s Quidditch team from Holyhead, a town on the Welsh island of Anglesey. In the Harry Potter books, Ginny Weasley supports the team, and she later becomes a professional Quidditch player herself before working as a sports journalist.
The team’s name is sometimes confused with other Quidditch clubs named in the series. The Chudley Cannons are Ron Weasley’s favorite team, while the Montrose Magpies are a Scottish club. The Appleby Arrows are another British team associated with the fictional sport.
The Holyhead Harpies also appear in background material connected with the wizarding world. Their identity helps show that Quidditch has an organized professional culture extending beyond Hogwarts and beyond the English teams most often mentioned in Harry’s story.