Probably from mashah; extricated; Nimshi, the (grand-)father of Jehu -- Nimshi.
see HEBREW mashah
H5250. Nimshi
נִמְשִׁי proper name, masculine grandfather of Jehu 2 Kings 9:2, 14; בֶןנֿ ׳יֵהוּא 1 Kings 19:16; 2 Kings 9:20; 2 Chronicles 22:7; ᵐ5 Ναμεσθει, Ναμες(ς)ει.
נֵס see נסס. נְסִבָּה see סבב.
נְסָה see נשׂא. Qal imperative