Dionysius

Dionysius is the name of the Greek god of the grape harvest, wine and winemaking, fertility, theatre, religious ecstasy, and ritual madness. He represents freedom as he encourages his followers to dance free of self-conscious care and fear.

Dionysius isn’t a widely used name — it’s unique. However, if you want an alternative, the Roman equivalent is Bacchus, which resembles Marcus in some ways.