Please provide your source for that etymology.
"The word "obelisk" literally means ‘Baal’s Shaft’ or Baal’s organ of reproduction. This should be especially shocking when we realize that we have a gigantic obelisk in our nation’s capital known as the Washington Monument." [Dr. Cathy Burns - Masonic and Occult Symbols Illustrated pg 341]
And yes, Bel is Baal. Baal was the sun God. It's traces all the way back to Babylon as I showed in the verses from scripture.