I have often heard Shneur is from French "Seigneur" (lord). So indeed, Senior seems right...
"Two lights" would indeed be Shneorot!
I actually asked my husband.
He said, maybe "SECOND light"!
~~ Claire ~~
My ! are Alia, Eidel, Enola, Israel, Dudel, Yuri, Lina, Lorelei, Leilani, Owen, Julian, Glorinda, Mirinda
My ? are Hillel, Meshullam, Johnny, Ginny, Cordelia, Fiammetta, Yocheved
My ~ are Tehila, Tilda, Hailey, Gillian, Huldah
My / are Aglaia and July