There's a brand of Japanese knives that don't have a handle, one piece.

Sha Ra Ku Mono

The best knife I have ever held. Buy it for life. There's another Japanese brand called Global and they are one piece but not as amazing to hold as the Sha Ra Ku Mono. My wife was a professional chef so we splurged to get her a full set over the years. The bread knife is a fucking chainsaw man... You have to really be careful or it'll bite you HARD.

I think only one place outside of Japan sells them. https://seacut.com/collections/sha-ra-ku-mono