Now I had to google. So Regulus is the same word as regal, basically (King star) and is in the constellation Leo I think. Or something else leo... It's also the brother of Sirius Black. But I can't find much on who the star was named after, i e who Regulus was "originally". At least not in the first quick scan of the first page of google results...
Now I just have to watch the first few minutes of the next Rookie episode to see what happened to one of the officers who past out at the end of the previous episode and then it's bedtime.