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Esperanto is probably the most widely spoken international auxiliary language[0].

[0] https://en.wikipedia.org/wiki/International_auxiliary_langua...

For that matter, isn't English?

It's an official language in many countries, such as South Africa, India, and Ireland, each of which has other official languages.

Especially in Asia, where it's not exactly a primary language for anyone. It's funny that you'll be in a room with Chinese, Egyptians, Pakistanis, Indonesians, Ukranians, and everyone will speak English. I once saw a documentary which went deep into Borneo, via rivers, to a tribe that didn't wear shirts, and they spoke fluent English too.

I think the point is that of intentional international languages (i.e., international in the sense of not being tied to any particular country), Esperanto is the most widely used one.

That still is going to be a quite small number against English, Spanish, French &c. in terms of being a lingua franca.