SIVAN (sē-van', Heb. sîwān). The name given to the third month of the Hebrew sacred year; this is the ninth month of the civil year (Esth.8.9). See also Calendar.
SIVAN sī’ văn (סִיוָן, H6094). The third month of the Jewish calendar (May-June).
International Standard Bible Encyclopedia (1915)
se-van’, si’-van (ciwan): The third month of the Jewish year, corresponding to June (Es 8:9).