This pertains to all "Bazalduas or Basalduas".
The original spelling is Basaldua, but in some cases it
got changed to Bazaldua. The name itself came from the
Basque Country. Now the Basque Country is actually in Spain.
You can check out "Basque Country" in Wikipedia.
The name itself means "High Forest". Basa or Baso means Forest. ldua means High, therefore "High Forest.
I hope this will help you in your search. Good Luck!