H Fili Tis Koris Mou Greek Sirina [better]

This is likely a fan-made or "Sped Up" edit that went viral on YouTube around 2021. The creator likely renamed the file "Greek Sirina" to avoid copyright strikes, and the name stuck.

To understand the popularity of this track, one must visit Greece during the summer. Here is where lives: H Fili Tis Koris Mou Greek Sirina

If you are referring to a different song with a similar name, here are some relevant details about Sirens in Greek mythology: This is likely a fan-made or "Sped Up"