Genesis 5:32

"After Noah was 500 years old, he became the father of Shem, Ham and Japheth."  Genesis 5:32

Instead of just mentioning one of Noah's sons the Bible tells us the names of three of his sons and then stops there.  It looks as if he only had the three sons.  It doesn't tell us how close in age these boys were or if they were triplets only that Noah had them all by the time he was 500.

Shem means name, Ham means hot, and Japheth means opened.