Ferencz in my family was Ze'ev in Hebrew (which means wolf) and Wolf in Yiddish and Hungarian. One cousin/uncle that I remember from childhood I called "feribachi", Uncle Feri so Feri was either a nickname for Ferencz or some version of it. Another Ferencz is Tzvi Hersh. These names were primarily from my Farkas side who were from Transylvania and Hungary.
As for Sari it could also be Sure or Szure.
For Betti perhaps Bracha in Hebrew.
BTW, I have several Maliks in my tree mostly connected to Stauber, Stober, Shtauber, Stojber, etc. And a lot of my cousins did DNA.
Boynton Beach, FL