Name days on August 4
None of the saints of this day carries a name in common use, so there are no widely kept name days on August 4.
Saints and feasts of August 4

Seven Youths of Ephesus
Saint, Επτά Παίδες Εφέσου
The Seven Holy Youths of Ephesus were young Christians of noble standing who, during the persecution of the Emperor Decius in the third century, took refuge in a cave outside the city rather than sacrifice to idols. There, by the providence of God, they fell into a wondrous sleep, and the cave was sealed.
Eudokia (Ia) of Persia
Holy Woman, Ευδοκία η Περσίδα
Saint Eudokia, known also as Ia, was a Christian woman taken captive in Persia in the fourth century. Tradition relates that she converted many Persian women to Christ and was tortured and put to death for her faith.
Thathuel the Martyr
Martyr, Θαθουήλ
The synaxaria record that Saint Thathuel was a Christian who confessed Christ before pagan officials and was hanged from a tree for his faith.