The term "Homotopy" was given by whom?

Question

I want to know the names who define the term 'Homotopy' in algebraic topology in 1907. Are they Dehn and Paul Heegaard?

What is the full name of Dehn?

Thank you in advance.

Answer 1

According to Jean Dieudonné, A history of Algebraic and Differential Topology, 1900-1960 (1989), page 43 :

The words homotopy and isotopy were coined by Dehn and Heegaard in their Enzyklopädie article with a purely combinatorial definition adapted to their "abstract" conception of homology ([*], pp. 205-207), and they were not retained by later workers, with the exception of Steinitz.

Brouwer [in 1912] seems to have been the first to give our present definition of homotopy ([L.E.J.Brouwer, Collected Works, vol. II, North Holland, Amsterdam, 1976], p. 462)

[*] The paper by Max Dehn and Poul Heegaard, Analysis Situs, Enzykl. der math. Wiss., Ill 1 AB 3, Teubner, Leipzig, 1907.