Why do some people in the British Isles speak Gaelic?

The British Isles include England, Scotland, Wales, and Northern Ireland; not all of these countries have Gaelic-speaking populations.

Ireland is the only nation in the British Isles where the majority of the population speaks Gaelic, also known as Irish. Gaelic was also spoken in Scotland and the Isle of Man, but its use has declined over time, and it is now considered a minority language.

Therefore, the main reason some people in the British Isles speak Gaelic is that it is the indigenous language of Ireland, and it has been preserved and promoted by initiatives like the official status granted to the language in the Republic of Ireland.