Ruairidh is a traditional Scottish Gaelic name for boys derived from the Gaelic words ruadh (red) and rìgh (king).  It is the Scottish version of the English names Rory or Roderick. 

In ancient Celtic culture, having red hair or a red beard was a symbol of strength, nobility, and special favor from the gods.  Because of this, the name has deep roots in Scottish Highland history and is closely tied to noble families and clan heritage.  Historically, giving a child this name was a proud way to show a direct family line leading back to early Gaelic leaders.