I don't know if you're still looking, but my great grandfather was Max Weintraub from Romania. We do have Sephardic blood. Rose was I believe his sister. Max's father's name was Yakov although in Romanian it's a derivative thereof. I have pictures and much more info. Max was a big donor in rebuilding the Great Synagogue of Bucharest although he became much more secular by the way.
Please contact me if this seems the right track for you.
Moshe Paul Mones (Maternal Grandmother's maiden name Madeline Weintraub, sister of Jack, Charles and Jules all children of Max)