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The names you mention are certainly not scientific. All those creatures also have a scientific name. People named them that way because dragons are part of our culture and those creatures were in some way reminiscent of the mythical dragons.

The bible is a collection of books most of which we do not know the origin although we can be certain they were ‘collected’ and do not have a common origin. All of them have passed through transformations and translations. All which are very old. Most of which have some basis in fact. That is a perfect description of a myth.

Notice that the more recent translations of the bible use the word 'dragon' less. As our knowledge improves and expands we need to use this kind of 'Something I don't understand' word less.