I don't really know who believes in these fairytales, as I have found that most my clients are pretty clued up and cynical to begin with and would ask me to quit the BS if I told them the hair came from somewhere in the Western hemisphere.
I don't know where it comes from, I don't know whether it's Chinese, Indian, a mixture of the two or if it indeed has a few token strands of Caucasian hair thrown in (it does happen that Europeans sell their hair now and then, just not in the quantities that seem to flood the market). I didn't cut it off anyone's head, so how would I know? Whoever sells the hair can call it whatever they like, if they say it's leopard hair, I can choose to believe them or not, but neither choice is a reflection of the truth.
My patience already stops when distinctions such as 'European' and 'Russian' and even better 'Ukrainian' are made. In what way should a Russian person's hair differ from that of an English person's?
Hair is a trade, it's money. Of course they're gonna call it fancy names in order to sell it at higher prices. Ultimately it doesn't matter, everyone should be grateful that there is this option of covering up defects like thin hair/too short hair/lifeless hair etc. If the result is there, why would it matter? When hair extensions only emerged as a service to the broad public 10-15 yrs ago, nobody cared.