At birth, Blessed Father Eustace was baptized by his parents with the name Hubertus van Lieshout. However, upon entering the Novitiate, the young man chose to use the name Eustace, a common gesture among religious who "became a new person" upon entering this new life.

The name that Father Eustáquio chose refers to Saint Eustáquio of Rome, a Christian martyr from the early centuries. In one of the prayer books of the Missionary of Health and Peace, there is an insert with the Litany of Saint Eustáquio, indicating the Blessed's devotion to him.

Saint Eustace of Rome

Saint Eustace is a Christian martyr and military saint who lived in the late 1st and early 2nd centuries AD. Before his conversion to Christianity, Eustace was a Roman general named Placidus, serving Emperor Trajan.

While hunting near Rome, Placidus had a vision of Jesus among the angels. After seeing the apparition several times, he converted and was baptized, also baptizing his entire family. Because of his story, he is now considered the patron saint of hunters.

A series of calamities befell Eustace to test his faith: he was robbed, his wife was kidnapped by the captain of the ship he was traveling on, and finally, while crossing a river, his two sons were taken, one by a wolf, the other by a lion. Like Job, Eustace did not lose his faith.

He would eventually regain his prestige, positions, and reunite his family. However, when he demonstrated his newfound faith by refusing to make a pagan sacrifice, Emperor Hadrian condemned Eustace, his wife, and children to death, ordering them to be cooked alive inside a bronze bull in 118 AD.