The most beautiful girl you could ever come across. Usually someone who always makes you smile but who's own smile makes your day. If her middle name is Anwen then you know you've found a great Haleigh because Anwen essentially means beautiful in Welsh. Haleighs often have a certain face they like to keep from others to protect their friends from extreme repulsion.
Haleighs are also very whalelike in shape but deny it in front of others but secretly cry about it while home alone at night.
A Haleigh could be all those negative things listed above or they could just be a very attractive girl who would just make your heart melt if you were dating her because of her uniqueness, beauty, sweetness, and loveableness.