Not sure hair color has much to do with what type someone is...so I am thinking it might just be coincidence more than anything else since I doubt similar physical traits among the women isn't what made them see you as attractive. Perhaps you've been attracted to women with those physical traits so you've noticed the ones with them that are attracted to you more than other women. I know I get this weird thing where if I become familiar with a detail like a type of car someone I know has, or their hair color and features I will notice a lot more people with the features or will see a lot more of that particular car so could be something like that.
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Metal never dies. \m/