Attach whatever label to it you want. The only thing that matters is whether it makes society happier overall. It certainly makes you unhappy, but the people who receive the money are made happy, and histories have shown us the stratified societies that result from a lot of hereditary wealth/position are less happy than the ones with high social mobility. You might think this is unfair. Being born in an underclass in a stratified society is unfair too.

If you really believe in individual sovereignty, a society that maximizes social mobility should be inherently attractive to you. The John Galt type that the right idealizes would have been nothing if he'd been born an untouchable in pre-British India.

That being said, I recognize that a tax would discourage some people from being as productive as they might otherwise be. At the same time, I suspect that many people will work harder under more fair conditions. It's hard to say what the net effect will be.

Of course, if you have other ideas for promoting a fair society with social mobility along with realistic methods of paying for them, I'm happy to hear them.