I'm 98% certain Amanda is female.
According to a dataset of 47615, the average Amanda is around 29 years old.
In part this is a feminine form of Amandus. However, it was not used during the Middle Ages. In the 17th century it was recreated by authors and poets who based it directly on Latin amanda meaning "lovable, worthy of love". Notably, the playwright Colley Cibber used it for a character in his play Love's Last Shift (1696). It came into regular use during the 19th century.
We use a combination of data from the internet, and our own Machine Learning models to make these predictions.
In a gist, we use a Machine Learning model trained on a diverse global dataset of 100m+ names, and use it to predict different traits for a person based on first name!
NameGuessr guesses a person's nationality, age, and gender based on their name. We also try to give insightful info around the name's origin, name meaning, and name pronounciation.