If you looking for religious background on surname Waldman in Bohemia, you're right, it might have to convert to Catholicism. Waldmann surname can be seen in the German-speaking families, but also among Jewish families – in Central Europe.
But, I looked at the Jewish registers of the city Kasejovice.
Index born between 1788-1862:
Weis, Weiskopf, Weil.
Index of weddings in the years 1788-1927:
Weiskopf, Weis, Wodnansky, Weil, Weisl, Wedeles, Weigl, Wolf.
Index of deaths in the years 1788-1895:
Weis, Weiskopf, Vocasek, Wodnansky, Welberg, Wurm, Wachtel, Wedeles.
So, no footprint, in this period ...