Maybe because Liouville and Hamilton, being mathematicians, are better known to the target audience than the physicists Schrödinger and Heisenberg?

I know the difference between mathematicians and theoretical physicists can be small, but I think that categorization is valid.

To verify my intuition, I checked Wikipedia. It calls

- Liouville a mathematician and engineer (https://en.wikipedia.org/wiki/Joseph_Liouville)

- Hamílton a mathematician, astronomer and physicist (https://en.wikipedia.org/wiki/William_Rowan_Hamilton)

- Schrödinger a physicist (https://en.wikipedia.org/wiki/Erwin_Schrödinger)

- Heisenberg a theoretical physicist (https://en.wikipedia.org/wiki/Werner_Heisenberg)