How many children did Spartacus have?

There is no record of children.

Plutarch says Spartacus had a wife, a Thracian who was enslaved with him.

The name Spartacus is otherwise attested in the Black Sea region: kings of the Thracian dynasty of the Cimmerian Bosporus and Pontus are known to have borne it, and a Thracian "Spardacus" or "Sparadokos", father of Seuthes I of the Odrysae, is also known.