The image given design is very impressive and I really liked the designs used as background images and decoration.
Is there a name for this design and author?
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One similar example is the traditional, Japanese Bishamon-Kikkō, Bishamon tortoiseshell or "Bishamon's armor" motif. Traditional examples can be angular or curved but you can find many variations including ones near-identical to your posted image.
There is no universal western name for this pattern but there are terms that define it accurately. It is a seamless/tileable, geometric, isometric, tesselation.
Some stock websites also use the terms "3D" or "optical illusion", although this is usually reserved for shaded versions that simulate a distant, uniform light source. As others have stated it is a very old pattern, seen in multiple cultures, and is most certainly part of the public domain.