Is Lucifer Satan?!

This is true, it’s the title of the Archangel Samael.

Acutally, satan is from the Hebrew language. שָּׂטָ֖ן is the Hebrew word, though it’s pronounced with long 'a’s so it’s pronounced [Saw-Tawn]. It only means “adversary” or “accuser”.

In the Septuagint (the miraculous Greek Translation of the Hebrew Old Testament) they translate satan as διάβολος (diabolos) [dee-ab-ol-os]. Which is where we get the words diabolical and devil. Like it’s Hebrew counterpart it only means “slanderer” or “accuser”. The word itself is a combination of two Greek words διά (dia) which “through, on account of, or because of” and βάλλω (ballo) which means “to throw” or “to cast”. So, a διάβολος throws it’s insults through its target.