In popular use, soffit most often refers to the material forming a ceiling from the top of an exterior house wall to the outer edge of the roof, i.e., bridging the gap between a home's siding and the roofline, otherwise known as the eaves.
So it's basically Dark Father. (Rolling Stone, June 2, 2005). Vader is the Dutch word for father (the Dutch word is instead pronounced fah-der), and the German word for father (Vater) is similar. However, in the earliest scripts for Star Wars, the name Darth Vader was given to a human Imperial general.
Not all German first or last names have an English equivalent, but many do. We won't bother with obvious ones like Adolf, Christoph, Dorothea (dor-o-taya), Georg (gay-org), Michael (meech-ah-el), Monika (mow-ni-kah), Thomas (tow-mas), or Wilhelm (vil-helm). They may be pronounced differently but the resemblance is hard to miss.