Puzzling surname change - house surname?

I am puzzling over a  surname change. From 1833 to 1869 my ancestors' surname changed back and forth between Bucskanyin and Falajtar. After 1860 the name stayed as Bucskanyin. Children were named either Bucskanyin or Falajtar and I cannot find an ancestor before abt 1804 that I can definitively link with EITHER surname. Several records are recorded as     Bucskanyin /:Falajtar:/ and one is recorded as Falajtar /:Bucskanyin:/

I cannot find a marriage that would explain this so I'm leaning toward the theory that this is a house surname. The house number is consistently 136 throughout in Cziroka Hossumezo, Slovakia. 

Is there a way to determine what the actual surname is/was and what was the house name? I tried tracing the house number through the county records (all 500+ pages) but could not find anyone at all in that house prior to 1833 (were houses ever renumbered?). 

I am new to genealogy but finding it endlessly fascinating!