How deponent (and semi-deponent) verbs appeared in Latin, and why?
How did they evolve in descend languages? They seem extincts in descend languages (why?) but there are probably specific structured inherited of this atypical grammar.
I've read in Wikipedia:
Latin also has some verbs that are active in form but passive in meaning. fit (it is made, done) was used as the passive of facit (to do, to make). In the perfect forms (perfect, pluperfect, and future perfect), this was a compound verb just like the passive voice of regular verbs (factum est, it has been done).
Why they have no name (at least the name is not mentioned in the article, and I've only heard people talking about deponent verbs.
Is it the same for them?
Specifically about the origin (and not the other facts), I've found these related thread, with some answers about the origin:
How accurate is the typical definition of a deponent verb? (this one, being too difficult to understand for me)
Are Deponent Verbs a feature of the Latin Language or Means of Translation?