I want to know how the Standard Model theory got such "generic" name.
The Standard Model of particle physics got its name from the late Sam Treiman. It was first coined in 1975 when Treiman, together with long time friend Abraham Pais, published a paper in which they used "standard model" to reference the four quarks theory.
And Treiman's own distinguished students such as Jonathan Rosner:
Professor Treiman was a "major force" during the synthesis of particle physics theories into the Standard Model. As an eminent educator, he strongly influenced the Standard Model's birth both through his own work and through his dozens graduate students, many of whom went on to be great contributors to the Standard Model and particle physics.
The origins of the term are somewhat obscure. In the book "The Rise of the Standard Model: Particle Physics in the 1960's and 1970's," the authors write:
The term "standard model" was faddish in several different scientific contexts in the 1960s and 1970s, however, I think the reason it became adopted permanently in physics was the influence of the use of the term in astronomy. In astronomy the model of the evolution of the universe which today we know as the "Big Bang Theory", was frequently referred to as the "standard model" because there were many different theories of the universe, but the Big Bang theory was by far the most popular, so it became known as the standard model. For example, you can read about this usage in the lecture "Relativistic cosmology" by Ellis, Cargese Lectures in Physics, 1973.
So, that was 1973. Right about this time the same term started to get applied to then-current Weinberg-Salam theory of quantum particle physics. The earliest reference to this in a paper I could find was, "Weak nonleptonic decays of charmed hadrons in models with right-handed currents" by G Branco, RN Mohapatra, T Hagiwara, DP Sidhu. Physical Review D, 1976. In this paper it says,
A paper published soon after, "Limit on mass differences in the Weinberg model", by M. Veltman in Nuclear Physics B, Volume 123, Issue 1, 16 May 1977, uses the same term, but says "the so-called standard model". Thus, Veltman uses the term, but prefaces it by "so-called", indicating that the term was new and not universally accepted in 1977.
By the next year, however, the term was on the way to being accepted. For example, in the review paper, "The geometry of generalized quantum logics" by TA Cook, International Journal of Theoretical Physics, 1978. In this article it reads, "The first example we develop is the standard model of nonrelativistic quantum mechanics."
In 1979, Sheldon L. Glashow, Abdus Salam, and Steven Weinberg, received the Nobel Prize for physics for their theory, but the commendation does not use the term "standard model." Nevertheless, at the time (1979), it was widely accepted to refer to their theory as the "standard model" of quantum particle physics.
I believe the long history of building a comprehensive model of sub-atomic matter, all successively named, simply resulted in physicists running out of names after Quantum Electrodynamics (aka QED) was no longer descriptive. Everyone just got tired of coining new names as the theory really stabilized and gained acceptances as The Standard odel.