Upvote:1
Ok i'm updating my answer as of new thing i'v found. baaru is a title which full form is baarula i.e wasp in english. The thakuri's of Nepali origin i.e simha and malla thakuri was obscure in nepali history. But with this new palace remains found in nuwakot, we can conclude that the singh thakuris root was baaru/baarula rumba. rumba here is family name who is also called thari lama (lama clan) Malla thakuri and singh thakuri were two brothers. So we also see malla thakuri root is also this rumba clan. Their are two brothers in rumba clan one is baaru/baarula(wasp) and another is aringal(hornet), baaru rumba is singh and aringal rumba is malla.