Do we have knowledge of any scientists of Ancient Egypt? If yes, were they originally from Egypt, or were they from other regions such as Europe, North Africa or Asia? Any examples?
Consider the flourishing of the New Kingdom:
The rise of the New Kingdom was immediately preceded by the rule of The Hyksos:
i.e. The Hyksos were not Egyptians. See: Modern scholarship usually assumes that the Hyksos were likely Semites who came from the Levant.
Concerning the period of Hyksos rule, Egypt made many technological advances:
Arguably, the zenith of Egyptian power and success, the New Kingdom period, was to a large extent the result of those innovations introduced by the Hyksos. If so, although we may not be able single out particular individuals who were or were not Egyptian, we can make a reasonable assertion that the flourishing of ancient Egyptian culture, exemplified by the New Kingdom period, was the result of the non-Egyptian science and technology introduced by the Hyksos.
Disclaimer: I am by no means an Egyptologist, and I'm quite certain I've merely scratched the surface of a subject that has been discussed in far more depth in scholarly literature.
(An interesting aside concerning the Hyksos: For those seeking extra-biblical support for the presence of the ancient Hebrews in Egypt, see: The Hyksos continued to play a role in Egyptian literature:
However, I believe that modern scholars have found little support for this claim.)
Science is a modern concept, "a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions".
Although the ideas of science came gradually, and it is not possible to point out a single moment when science was born, the first real science and the first real scientists are usually attributed to the 15th to 17th century, and the scientific revolution.
In ancient Egypt there was for example no difference between medicine and magic. The famous architect, engineer and physician Imenhotep (probably) wrote a medical text that is well known for being very practical and having very little magic in it. But it too contains magical spells, showing that Imenhotep also did not adopt a wholly scientific attitude. Instead the text is probably low on magic because most of the ailments it is concerned with are external. Much of it deals with trauma, and it is probable that it was a text book rising out of, and used in, battle-field medicine.
So there were no scientists in ancient Egypt.