[ravenwolf]

How do arrive at that?

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In Genesis 10
1 Now these are the generations of the sons of Noah, Shem, Ham, and Japheth :

The oldest is usually named first, ham was second, Japheth was last and probably the youngest.

[TexasGator]

“The oldest is usually named first, ham was second, Japheth was last and probably the youngest.”

Usually they are listed in order of importance. Genesis 10:21 says Japheth was the oldest.

21 And children were born also to Shem, the father of all the children of Eber, 4the brother of Japheth the elder.