The word "halogen" is from Greek words meaning "salt" and "maker." Every type of salt contains a halogen, as common table salt (sodium chloride) contains chlorine. ************2nd Opinion...
The name halogen comes from the Greek words "halos"=salt and "genos"=produced by; halogens can produce salts, halogenides. The term was introduced by Berzelius.
Halides are elements that include an halogen element in them. Halogen are all the element in the column that starts with fluorine. Example: AgF, NaCl, CuCl2, etc.