Yes, and this is a male of the species which have the large feathery antennae.

Thank you!!!! Is there a common name? Are there any folklores about this beautiful moth? Is it common to the Seattle area?

That 'is' the common name. This is 'the' most often encountered species of giant silkmoth in the Pacific Northwest, west of the Cascades, anyway. They probably are quite common, but the adult insects live for a very short time (they don't even have functional mouthparts, surviving on fat stored in the larval stage), and must quickly find mates. That is where those feathery antennae come in. The appendages are very good at detecting the minutest quantity of the female's pheromone, a species-specific sexual attractant chemical that she releases. Look for the larvae feeding on maple and other trees. They are incredibly cryptic for their size, though.

Thanks for the super speedy response to my curiosity. I have found a new friend in the woods where I work.