Elf... Arda... Legolas... None of these words match any entry in Data's memory bank. So unfortunately, besides this person's name this gives Data no useful information. He wishes suddenly that he had his tricorder.

"My name is Lieutenant Commander Data, Second Officer of the starship U.S.S. Enterprise." he replies, with a quick nod of his head. "Mr. Legolas. Could you tell me more about this place? I seem to have arrived here by accident."