Lol, I'm pretty sure there is no stripper/sex worker named
Tatiana in the Bible. In any case it's a really nice name, and the Thotiana connotations will definitely pass.
Tanya is actually a Russian nickname of
Tatiana, if that interests you at all.
Other suggestions are:
Elena;
Valentina;
Lilita (a variant of
Lilith, who is a sorta shady person in the Jewish tradition, in case you really wanna mess with your MIL);
Anastasia;
Olga;
Xenia; Saveta (endearment of
Elisaveta /
Elizaveta);
Ariadna;
Ekaterina /
Ecaterina;
Elvira;
Stefaniya /
Stefania;
Tamara;
Veronica;
Valeria