Is because the name "Bitcoin" is the best name for a crypto-currency.
No other name will be as good.
I think people will always find a cooler name than bitcoin, but the reason why Bitcoin is number one because of being the pioneer of cryptocurrency and being adopted by majority of population of cryptocurrency. And that is also the reason why Bitcoin is almost the best name for cryptocurrency.
Yes, I'm agree. That fact that bitcoin is on the first place doesn't have anything with it's name. The popularity of bitcoin made cause of it's was the new thing and first thing in the area of crypto currencies. Such new projects as bitcoin usually have a big future in the history, the same as invention of telephone or radio. Other crypto currencies are jut trying to be the same as bitcoin with the wish to repeat it's success.