With over 74,000 different named daylilies and so many that look almost identical it will be hard to know for sure what it actually is. Did you buy these with names and lost the tags or have they always been unknown? If you have a list of names you bought it would be easier to ID. Being a double may make it a little easier to ID though
Where did you buy it from? Can you possibly send the seller a photo and see if they can give you a name?