This is fairly certainly a variant of “Senora” which comes, unsurprisingly, from the Spanish word “Señora” (originally meaning lady of high or noble birth.) This has been used as a name in countries with Spanish influence for some time.
Harry Belafonte’s song “Jump in the
Line” is about a woman bearing this name. The fact that the name appears in Trinidadian Creole further solidifies this theory. The first colonizers to arrive on the island were Spanish speaking and remnants of the language persist.