Who is Sonic's daughter?

Excuse me, could you clarify something for me? I've come across the mention of "Sonic's daughter" in a conversation or perhaps in some media content, but I'm not entirely sure who or what this refers to. Is this referring to a character from the Sonic the Hedgehog franchise, perhaps a new addition to the series that I'm not aware of? Or is it perhaps a reference to something outside of the Sonic universe? Could you please elaborate or provide some context to help me better understand this phrase? Thank you for your assistance.