Help Unknown device on screen mirroring

[Mjacqurs]

I often play videos on my smart TV using the "via home networking" sharing option. The other day a strange new device popped up as an option: "Ash and Tess" via screen mirroring. I immediately thought someone had cracked my network password and was connecting to our wifi. I changed the password and it was still there (also router shows no unknown devices connected). I took my phone off the wifi and tried to share and my devixw still gives me this option which I found very odd. Now I'm worried this is so e sort of malware on my phone. I have avast and don't download suspicious stuff but I can't think of what else this option would be. Is it some device from an old network I connected to that keeps showing up for some reason?

Any thoughts?

Thanks.