dayanEtymologyJewish surname from Hebrew דַּיָּן (“rabbinic judge”).nameA surname from Hebrew.“The Samson Option states that Moshe Dayan gave the go-ahead for starting weapon production in early 1968, putting the plutonium separation plant into full operation.”nounA rabbinic judge.“A medieval hymn composed by the Dayyan ("Judge") Daniel b. Yehudah of fourteenth-century Rome, recited in the daily morning Preliminary Service, and by some, at the close of the Arvit and Musaf services on Shabbat and festivals.”