About the Irish Gaelic language
Language family
According to the Endangered Language Project, the classification of the Irish Gaelic language is Indo-European, Celtic, and Goidelic. The "mother language" for Irish Gaelic is Latin. On Wikipedia, Irish Gaelic is under the Celtic language family and the Celtic language family is under the Proto-Celtic language which is a branch of the Indo-European language family which all ties into Latin being the mother language.
Endonyms, autonyms, and exonyms
The different variants and dialects according to the Endangered Language Project are Connacht, which is spoken in Western Ireland, Donegal, which is spoken in Northern Ireland, and Munster, which is spoken in Southern Ireland.
Other names for Irish Gaelic can be Gaeilge, Irish, Erse, and Gadhelisch.
Speakers
According to the Endangered Languages Project, who used the 2006 census as reference, there are approximately 20,000-40,000 native speakers worldwide. Below is a quote from their website explaining their findings:
"'Whether all the 64,265 individuals registered by the 2006 census are native speakers of Irish is uncertain.... If for argument’s sake one subtracts about a third, because the officially specified sizes of the Gaeltacht areas are exaggerations and because not everyone, even in the core of these areas, has grown up speaking Irish as a first language, then one reaches a figure of somewhat over 40,000 for the native speakers of all Gaeltacht areas....In fact this figure may in itself be too optimistic. If one considers the number of persons in the Gaeltacht who use Irish on a daily basis outside education – 17,687 – and compares it to the population of the entire state – 3,990,863 – then one reaches a percentage figure of 0.44%. Given that the number of active native speakers is probably not higher than that of those in the Gaeltacht who use Irish on a daily basis outside education, then the percentage of active native speakers in present-day Ireland would be between around 0.5%, i.e. 20,000 or perhaps a little above that.'"
According to Wikipedia, who used the 2016 census as reference, 39.8% of the population said they could speak Irish Gaelic; this means that 1,761,420 people out of the total population of 4,921,500 people can speak this language. Further down on the page, it states that 40,000-80,000 people speak this language as their first language.
Where is it spoken?
The Irish Gaelic language is spoken in the country of Ireland. There are multiple dialects of the language such as Ulster, Connacht, and Munster. The Ulster dialect is spoken in Northern Ireland, the Connacht dialect is spoken in central Ireland, and the Munster dialect is spoken in Southern Ireland. These are not the only dialects of Irish Gaelic but they are the main ones spoken on the Island.