extract to a new folder with spl name
How about the date naming below and an attempt to ensure no more than one collision of names happens. You could also add seconds to the mix, but this seems more than robust enough for most cases.

DATE=$(date +"%Y%m%d%H%M")
final=${file1sname}_${DATE}
if [-a $final]
  then final=${file1sname}_${DATE}_1
  sleep 60 
  #we will prevent another run of this tool in the current minute 
fi