What is the hebrew word for holly?

Answer 1

If you're talking about the name Holly, there is no Hebrew equivalent. You would just spell it הולי
If you're talking about the species of tree called holly, it is tseeneet (צינית).

(Not to be confused with the English word "holy")

Answer 2

Holly:

• If you're talking about the name, it is spelled phonetically as הולי
  
• If you're talking about the species of tree , it is tseeneet (צינית).
  
• (Not to be confused with the English word "holy" which is kadosh קדוש)