In Hebrew sacred texts and religious writings there are references to “a satan” or “the satan” as it it was a noun rather than a name, and also as if there were many of them.

Remember that “satan” translates variously as “obstacle,” “adversary,” “accuser,” “slanderer.” Being “a satan” is a role. There are probably many entities that this applies to. 

A few I see as being separate from each other but all probably satans are: Lucifer, Iblis, Beelzebub, Baphomet, Asmodeus, to name just a few. I would say Lilith is as well, but that might be controversial– in any case I think she’s more than earned the titles of adversary and accuser. 

Your mileage may vary. If you think those entities are all one big Satan, that’s OK. If you think some of them are not satans, that is OK. 

But I think this is a nice thing to keep in mind when wondering things like “Is Lucifer Satan?”