The usage of the word ‘Swiftie’ has seen a significant increase in September 2023 compared to the previous year, most likely due to the extensive coverage of Taylor Swift’s successful Eras tour. The term is derived from the singer’s name, with the addition of the suffix ‘ie’ or ‘y’, commonly used to convey affection. Other words frequently associated with ‘Swiftie’ are ‘fandom’, ‘die-hard’, ‘hardcore’, and ‘self-proclaimed’. Interestingly, there are numerous examples in the English language of names for fans of popular musicians, such as the Beyhive (Beyoncé), Directioners (One Direction), Deadheads (Grateful Dead), and Beatlemania (fans of the Beatles).
https://languages.oup.com/word-of-the-year/2023/