Can you find a relative without knowing their last name?

Question:

Can you find a relative without knowing their last name?

Can ypu find out with DNA? Can you find someone with minor details?

Best Answer - Chosen by Asker: To do a DNA match you would have to have a sample from your relative's body.
Unless you've got the body laying around, in which case you might not need to ask this question... or unless you have a specific person you already know in mind...
Chances are you'd need a last name.
Plus, DNA testing is very expensive.