Can you explain how the science behind your name is Linguistics; how the science behind your morality is Ethics; how the science behind your desires and goals, is Psychology and Sociology.
Certainly: They are human inventions.
Human beings -- perhaps as a consequence of their self-awareness and self-consciousness -- are innately curious creatures, and over time, have classified their fields of study according to the objects of study.
Currently, humans are (to the best of our knowledge) the only creatures that use spoken language to express both concrete and abstract concepts -we call the study of language, "linguistics."
The fact that we designate certain sounds to express the concept of identity, and how we do so, would fall under linguistics.
In English, one might say, "My name is Bob."
In French, the same idea is expressed as "Je m'applelle Bob," which, translated word-for-word, comes out as, "I call myself Bob."
"Ethics" one could argue, is more of a philosophical study than a scientific one, that studies our morality -- that is to say, our understanding of "right" and "wrong" -- and its application in a social context.
That social context is important -- one could argue that someone marooned on a deserted island would have no need for ethics, since his actions would affect nobody but himself.
"Psychology" (the study of our behavior) and "sociology" (the study of the development of human society) would both come into play when discussing desires and goals, for one reason, to determine to what extent our desires and goals are innate, or imposed on us by society?
If, for example, your desire and goal was to get married, settle down, and raise a family, is that the result of your own belief that these are fulfilling activities which give life meaning (and for many people, they are indeed),
or is it a response to outside pressures -- from family, from education, from religion, from culture, etc... that this is what is
expected of you?
All fascinating fields of study, IMO, and all borne from, as I said, human curiosity. The names are strictly to organize the fields to keep everything straight -- you don't get very far if you're not organized. As Granny Valentine used to say, "people don't plan to fail; they fail to plan."