The name Quirin is short for Quirinus, which means ‘Spear’.
Publius Sulpicius Quirinus was a governor of Syria mentioned in the Bible. Judea was a part of Quirinus’ territory at the time that Caesar Augustus issued the decree for a census to be taken. This census was the reason Mary and Joseph trekked back to Joseph’s hometown of Bethlehem of Judea, where Jesus was promptly born in a stable.
Some nickname possibilities for Quirin could be Q, Quinn, or Rin. All are uber cool in my opinion.