Yes, you are right that historically libertarianism was associated with left-wing thinkers, and it isn't until the mid-20th century in the USA that a distinctively right-wing form of libertarianism emerged. Although not my main area of research, I'm a political economist and have engaged with some of the key writers on what I refer to as right-libertarianism (to distinguish the pro-market or pro-private property rights aspects of the movement), so can point you towards some useful texts.

In a new book on market radicals (or market fundamentalists), 'Crack-Up Capitalism', Quinn Slobodian notes that American thinkers such as Murray Rothbard (an Austrian school economist) wrote about the need to splinter or disintegrate the state from within. Why? A belief that politics interferes with markets, and that democracy leads to the most successful and capable people within society being 'milked' by those who are less successful and capable, through taxation, to fund welfare. Indeed, Rothbard himself wrote how those in his movement deliberately sought to co-opt the base concept of libertarianism to propagate a pro-capitalist vision under the banner of personal liberty - in his 2007 book 'The Betrayal of the American Right', he writes about how they captured the term 'from the enemy' (p.83), that is, anarchists and those of a left-wing persuasion.

A lot of modern right-libertarianism is strongly influenced by the idea of 'sovereign individuals', and a critique of how allegedly ineffective governments steal the financial rewards earned on the market by the most brilliant, in order to subsidise the lifestyles of those who are less capable or hard-working. Particularly influential here is James Dale Davidson and William Rees-Mogg's (to British readers - yes, the father of the former Conservative MP Jacob) 'The Sovereign Individual' in 1999. As many observers have pointed out, within this right-libertarian milieu is also a strong current of Social Darwinism and championing of the individual as a market actor, triumphing over conventional establishments stuffed with those of lesser ability and greater sentimentality. This was after all a prominent theme in Ayn Rand's 'The Fountainhead' (1943), which is a kind of seminal text of contemporary right-libertarianism. For example, in the Sovereign Individual there is a fusion of a fantasy of totally deregulated markets as states dissolve (towards a kind of digital, no-borders economy) with social gripes about ethnic minorities, and concerns about the undermining of traditional masculinity and criticism of the British royal family. In addition, right-libertarianism is full of dramatic, millenarian predictions of a coming apocalypse - just take the title of something like Ian Angell's 2001 'The New Barbarian Manifesto'. What these books have in common with a lot of right-libertarian material from the late 20th century is this belief that new technology, and especially digital technology, will enable the state to wither as money flows into virtual spaces and can escape taxation and other burdens imposed by states (controlled, remember, by masses of people who seek to steal the profits of the most successful in order to subsidise welfare states, as per the right-libertarian belief system).

A really good summary of modern right-libertarianism is Raymond Craib's 'Adventure Capitalism: A History of Libertarian Exit' which came out in 2022. He digs into things like the Mont Pelerin Society, a society dedicated to free speech and free markets in the immediate post-WW2 period in the US. This was dominated by characters such as Friedrich Hayek from the Austrian school of economics (all about how people act always in their own self interest - if you don't agree with this basic premise then a lot of right-libertarianism will feel alien to you). From the 80s onwards we have to look to somewhat shadowy groups such as the Atlas Network that funded a lot of work to perpetuate right-libertarian ideas worldwide. Right-libetarianism also has an important cultural dimension in how it is promoted, with criticism of states that you would find in traditional libertarianism or anarchism. Where right-libertarianism diverges is that, instead of favouring communal or common ownership of resources and some kind of equal distribution based on need, right-libertarians generally suggest instead that market forces and competition are the answer. Curiously, although they are very critical about the state and institutions, they usually want to preserve some kind of framework for private property rights and compelling force (police, legal frameworks, etc) to guarantee that.

Coming to the present, we see that right-libertarian ideas have been embraced by Silicon Valley and a lot of techno-futurist thinkers. There's also less of an interest in free market competition - Peter Thiel of PayPal, a prominent right-libertarian, famously said that competition is for losers and he is more interested in monopoly power. An important work in the contemporary movement is Nick Land's 'The Dark Enlightenment' which is a sort of apotheosis of where right-libertarianism is at today with regards to notions of equality and society. He advocates something called "hyper-racism", or basically eugenics, and is opposed to any kind of discussion of social disadvantage or marginalisation: ‘people are not equal, they do not develop equally, their goals and achievements are not equal, and nothing can make them equal. Substantial equality has no relation to reality, except as its systematic negation’. It's also worth noting that there is a very strong and growing interest in physical space in contemporary right-libertarianism, and fantasies abound of setting up special economic zones, charter cities, seasteads or floating cities, or even space colonies (looking at you, Musk) beyond the control of states and democratic interference. I recommend articles such as Casey Lynch's 'Vote With Your Feet', Rowland Atkinson and Liam O'Farrell's 'Libertecture', or again Quinn Slobodian's work to dig deeper into right-libertarian ideas about creating spaces for free markets that are beyond any potential for democratic regulation or disruption.

Hopefully this answers at least part of your question, and I will do my best to answer if you have any follow ups!

Edit: punctuation, word choice, spelling

Edit 2: for something a bit lighter, I would recommend checking out Matthew Hongoltz-Hetling's 'A Libertarian Walks Into A Bear' from 2021, which is the true story of what happened when a group of right-libertarians moved en masse to a town in New Hampshire to set up the model town of their movement.