How can I find the name of my yarn if I lost it?

I used up my yarn but did not finish my project…
I want to order more of the yarn but I have no idea what the name or brand are- is there any way of finding out?

Welcome to KnittingHelp!
Is it possible to trace your initial order, online or at your local store? if it’s a LYS you might go back to them and see if they can look up the sale. If it’s a chain store, you could take the project back with you and see if you can locate the yarn.
You can narrow it down by gauge and yarn type but there are still hundreds of possibilities out there.