I guess it just amazes me that anyone could think
Piper was "old-fashioned".
Piper was basically unknown as a girls' name before
Rosetta Jacobs was given
Piper Laurie as a stage name by someone at Universal Studios in 1949. So really there shouldn't be any girl or woman named
Piper who was born before 1950, unless they changed their name as an adult.
Piper Laurie herself just died twelve days ago at age 91.
So
Piper is actually an extremely modern name, at least as a feminine form, and not "old-fashioned" at all.
https://variety.com/2023/film/news/piper-laurie-dead-carrie-1235756354/