Shalamu (as in the other semitic languages from the common proto-semitic root SHLM/SLM)

At a rough estimate; 40% Latin, 25% Greek, 15% Proto-Indo European, 10% Sanskrit/Proto-Semitic

The Arabic language evolved over time from Proto-Semitic languages, with contributions from various civilizations in the Middle East. There isn't a single person or creator associated with the Arabic language.

"Central Semitic" is the euphemistic term used by linguists to refer to the variant of Proto-Semitic which would eventually split into the Levantine languages (like Hebrew) and the Arabian languages (like Arabic). However, no such language has ever been identified from historic writing samples. If it existed, it was likely only a spoken language.

The language spoken by archaic people varied depending on the time period and location. Examples include Proto-Indo-European, Proto-Indo-Iranian, and Proto-Semitic among others. These languages evolved into the modern languages we know today.