Final answer:
The nickname that Aven's parents had for her was "Trash Owl", but her proper name is Aven.
Step-by-step explanation:
The nickname that Aven's parents had for her was "Trash Owl". In the book, it is mentioned that after the naming ceremony, this teasing name became a running joke in the community.
Aven's family had to make visits around the community with gifts of kola to get everyone to recognize her proper name, which is Aven.