The first time I heard this name was in a modern dubbed version of
Heidi.
Clara and
Heidi decide to name the new foal
Astrid. While I don't love the name I think it is a good choice. Aster is my least favorite nn because I think of
Astor the American aristocrat from the early 20th century and it sounds masculine. I feel like
Terri (or any spelling of this) would also work as a nn for some reason.