Why Oak name for java

Why Oak name for java language Oak is a symbol of strength and choosen as a national tree of many countries like U.S.A., France, Germany, Romania etc. In 1995, Oak was renamed as "Java" because it was already a trademark by Oak Technologies.From OAK to JAVA I like to follow history behind computers and programming languages and I also wondered how peoples inventing or creating operating systesm or programming languages. One another thing amazed me is the way JAVA evolved and how Green team at Sun arrived the name so called "JAVA".

Java created for main goals1.    It should be object oriented2.    It should be easy to use3.    It should fully support network programming4.    It should execute code from remote sources securely5.    A single representation of a program could be executed on multiple operating systems