Translation guide
Gaelic refers to the Celtic languages of Ireland and Scotland. In Japanese, the term is usually expressed by specifying Irish or Scottish, as there is no single common word for both.
Referring to the Irish language
Standard term for the Irish language. Clear and unambiguous.
He is studying Irish.
Can refer to Irish, but may also mean Scottish Gaelic. Context usually clarifies. Less common than specifying the country.
Irish Gaelic belongs to the Celtic language family.
Referring to the Scottish Gaelic language
Standard term for Scottish Gaelic. Often shortened to スコットランド語 in casual contexts, but the full form is clearer.
Scottish Gaelic is spoken in the Highlands.
In a Scottish context, this can mean Scottish Gaelic. However, without context it may be ambiguous.
Referring to the Gaelic languages collectively or the culture
Simply saying ゲール語 may cause confusion between Irish and Scottish Gaelic. Always clarify which language you mean, or use the country-specific term.
ゲール語の歌を習っています。
I'm learning Gaelic songs.