The name has a strong historical and religious connection, as it is associated with several saints in the Catholic Church, including:
* Saint Ildephonsus of Toledo (c. 607-667), a Spanish bishop and theologian, known for his writings and his strong opposition to the Arian heresy.
* Saint Ildephonsus of Seville (c. 11th century), a Spanish bishop and theologian, known for his writings on liturgical practices.
While the name Ildephonse is still found in some cultures, it has become relatively uncommon in modern times. However, its meaning and its historical significance make it a powerful and unique name.