I like the names luna, neon, midnight, Zora these names would be so cute and you can use the name neon and midnight if you don’t know the gender of your Betta fish
List of Aquarium Fish Species by Common Name ..
These are small rainbow fish, reaching only about 2 - 2 1/2 inches (5 - 6.35 cm), and have brilliant blue iridescent scales and brightly colored fins. Dwarf Neon Rainbowfish is just one common name. It has quite a variety of very descriptive common names as well as number of names used for developed strains. It can be found as the Neon Rainbowfish, Dwarf Rainbowfish, Peacock Rainbowfish, Praecox Rainbowfish, Diamond Rainbowfish, and the Dwarf Blue Rainbowfish just to name a few.
The Best Pet Betta Fish Names - Alphabetized - The Spruce
Appropriately enough for such popular aquarium fish, both cardinals and neons have scientific names that honor fishkeepers. The neon tetra (Paracheirodon innesi) is named after William T. Innes, an aquarium writer who did much to establish the hobby in the United States. He was the editor of the country’s first monthly fishkeeping magazine, The Aquarium, and author of Exotic Aquarium Fishes, arguably the first English language encyclopedia of aquarium fish, which is still regarded as a classic text.
List of common fish names - Wikipedia
The Dwarf Neon Rainbowfish is also sold as the Praecox Rainbowfish, Neon Rainbowfish, Peacock Rainbowfish, Dwarf Blue Rainbowfish, Diamond Rainbowfish, and a number of other names for specific strains. It is widely available in pet stores and online and is usually moderate priced.