lol, either name is used — ladybird or ladybug.
Coccinellids are known as ladybugs in North America, and ladybirds in other areas. Entomologists widely prefer the names ladybird beetles or lady beetles as these insects are not classified as true bugs. wiki
Not true bugs? Must be confusing being a ladybird! Not a bug, not always a lady, and definitely not a bird :(