Dayan comes from Hebrew and Arabic roots meaning judge or one who adjudicates.
Dayan derives from the Hebrew root din, meaning "to judge" or "to plead a cause," and in traditional Jewish legal usage a dayan is a rabbinic judge who adjudicates matters of religious law. The title carried immense communal authority — dayans presided over matters of marriage, divorce, commerce, and ritual — and over centuries the word migrated from occupational title to surname to given name, carrying with it connotations of wisdom, fairness, and moral gravity.
The name is inseparable in the modern imagination from Moshe Dayan (1915–1981), the Israeli general and statesman whose signature black eye patch made him one of the most recognizable military figures of the twentieth century. As chief of staff during the Sinai Campaign and defense minister during the Six-Day War, Dayan became a symbol of Israeli resilience and strategic brilliance. His fame broadcast the surname as a given name internationally, and parents in Israel and the wider Jewish world began adopting Dayan as a first name in homage — consciously or not — to that legacy of decisive leadership.
Today Dayan functions as a given name in Hebrew-speaking communities and has spread modestly into Arabic-speaking cultures as well, where it carries similar connotations of judgment and authority. It has also been adopted in the Caribbean and Latin America, particularly in communities with Sephardic roots, and in some instances is used without any awareness of its judicial etymology — chosen simply for its strong, percussive sound and its air of quiet command.