My brother has a thing for indigenous women, are his likes common?

My older brother (age 23) is 5'11, wavy light brown hair, white and honey eyes. Yet a couple times he has said that he would like to one day marry a pure indigenous woman.

His own words were that they were exotic and of unique beauty. He has a thing for their reddish brown skin color, always did. He isn't too much into mixed women because according to him, they lost those features and don't seem natural anymore. He isn't too much into white women either even though he's white himself.

Are his likes common?

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It all started when he was a kid. One of his classmates was a Native American girl. He saw it as something rare and so he had a crush on her for that whole school year.
My brother has a thing for indigenous women, are his likes common?
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