Where is Eustachius from?

Meaning of the name Eustachius

Possibly from the Greek name Eustachys, or from the same elements. This (or Eustathius ) is the Latin name of Saint Eustace.

Characteristics of the name Eustachius

How do we know this about Eustachius

(and is it secret spies?)

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.