The creation and evolution of language is a difficult thing to pin down, since no one could possibly have recorded the origins of words in a written language before those words were spoken and understood many times.
Some theorists believe that language formed independently and almost arbitrarily, and that various cultures ascribed different meanings to different sounds. This means that, throughout the world, language (including the words that make up those languages) was formed in cultures without any conscious connection to other cultures that were also creating language. However, some individuals believe differently.
Some linguists think that certain sounds developed a type of language known as sound symbolism, and that sound symbolism is similar from culture to culture. Acoustic resonance and object mass, according to this hypothesis, have an inverse relationship. In plain language what this means is that the smaller and more diminutive an object is, the greater acoustic resonance the words developed to describe that object will be.