whoever Definition

1. Used in questions, indirect questions and statements as an emphatic form of who or whom.

Example: Whoever is that at the door?
Example: ask whoever you like
Form: who ever (also)
2. No matter who.

Example: I don't want to see them, whoever they are
3. Used to indicate that one does not know who.

Example: St Fiacre, whoever he was

colloq
... or some other such person or people.