Aster is a gender-neutral name and is of Greek origin. It can be used for both girls and boys. It means star. The name is currently in the top 1000 of U.S birth chart of the year 2019 and not in the top 1000 of NameChef Most Popular Baby Names.
Aster can be used for both boys and girls.
Please refer to https://www.pronouncenames.com/search?name=aster for the pronunciation of Aster.