The day sacred to the saint whose name a person bears.(noun)
The Century Dictionary (Public Domain)
Use "name-day" in a sentence
"At Tatyana's name-day party, Onegin, bored, flirts mischievously with Olga; Lensky, enraged, challenges the friend he also loves to a duel."
"August 25, the feast of St. Louis of France, was his name-day, and kept with special festivity after he became king in 1774."
"Skolt children received a “first tooth reindeer,” a “name-day reindeer,” and gifts on various other occasions, including wedding gifts of reindeer, so that a new household began with a small herd of the beloved animals."