Origin: Heb nīsān
See Nisan in American Heritage Dictionary 4
Origin: Hebrew nîsān
Origin: , from Akkadian nisānu, the first month in the Babylonian calendar (corresponding to parts of March and April)
Origin: , from Sumerian nisag, first fruits
Origin: : nig, ni, thing, nominalizing pref.
Origin: + sag, head, top, first.