There was a discussion somewhere earlier on this forum, don't know if it was here (Pattern Central) or somewhere else. Anyway, I thought I would share the link to this stitch pattern. It is called the "Box Stitch" and produces the same stitch pattern as the "Double Seed Stitch", the stitch multiple being the difference.
And this stitch (Double Seed) is also referred to as the Double Moss Stitch.
Double Seed Stitch