Sound shows the path
https://youtu.be/0H1M8vZdZXg?si=oktX6Fh-T-yftYey
This is just my assumption. Kadaifi and kadayfi show where they came from. 'Y' usually sounds middle(?) position that has existed in Middle Eastern Asia, so they had left the path of kadayfi. 'Y' including many insignificant alphabet within sounds show paths where they came from and where they had been through.
Anyway, congratulations, your baby soon.