This generator of mountain names gives you 15 names that match most high landscapes, such as mountains , hills, rocks and bluffs. The first 4 generic names in this generator are based on presence or history behind the mountain (for example, 'the prohibited mountains'). The last six names are actual mountain names but are totally randomized and thus usually non-existent in real life. The names should be pronounced in English, but for all kinds of fantasy-races and languages there are plenty of different sound names.
To generate another 15 random names you just have to press the button. With every click 15 new names are generated.
Most fantasy worldbuilding resources will advise you to begin with mountains, and for very good reason. But in this article did not ask you for a lot of things to get out of the way right off the bat. I thought that was a bit unfair to you. For starters, I'm an amateur writer (although I'm getting better), and if you asked me what to include I'd say mountains, hills, valleys, rivers, and a few villages. It may take you a little while before you get all these together, but that's okay. You'll just need to get more information to build upon what you already know. That's why it's important to read up on all the different subjects associated with the mountain ranges you plan on creating.
Now then, what about fantasy mountains that do not actually exist? Well there are a couple of ways to do this. You could start a new country. This may be more realistic than what you were thinking, or you could take your existing country and make it into a mountain range. A lot of people like to take their existing world, which is generally a landmass and turn it into a fantasy mountain range. This would require a whole set of new rules and a whole new set of game mechanics to implement to keep track of everything. Not to mention a whole new book-keeping system.
Then you've got the option of using fantasy mountains as points of interest. Maybe you're creating a fantasy country or continent of your own. Well you could take the mountain ranges and turn them into great locations to visit and adventure in. Maybe there are some real mountains in your fantasy world already, but instead of turning those into points of interest you could make it into a great location for exploration.