A Persian word (Assyr, sivanu, “bricks”), used after the Captivity as the name of the third month of the Jewish year, extending from the new moon in June to the new moon in July (Esther 8:9).
Easton’s Bible Dictionary
Sivan
Name meaninga bush or thorn
Easton’s Bible Dictionary (1897), public domain. Text via Theographic Bible Metadata, CC BY-SA 4.0.