Romani, or Romany, is the native language of the people called the Gypsies (though that term is considered deprecatory) and is a North Indian dialect, related to Hindi and Rajasthani.
Cornish has been extinct as a principal tongue since just before 1800, but is spoken by a fair sized population of native Cornishmen and -women who are avid on preserving it.
I’m not familiar with “Traveler Scottish” – anyone know anything more about it?
As has been discussed at length in other threads on this board, Scottish (AKA Lallans) is a Germanic language with a separate history than English but strongly convergent with English over the last three centuries, so that it’s effectively little more than an English dialect, even though it has as long a history and literature as English as a separate tongue.
There is some strong question about whether Pictish is a Celtic language, or even an Indo-European one. Not a huge amount is known about it.
To quickly map out the groups present:
With the possible exception of Pictish, the shopping list of languages mentioned above are all Indo-European. The Romany (“Gypsies”) are a group deriving from Northern India who have existed largely as itinerant traders and peddlers across Europe and Britain since the Middle Ages, and which have preserved their own native tongue for use among themselves.
Other than the Romany dialects, the languages of the British Isles are either Germanic or Celtic. Prior to the Anglo-Saxon invasions, most of Great Britain appears to have spoken Brythonic dialects, and Ireland and Man Goiledic dialects. The surviving Brythonic language in the U.K. is Cymric, AKA Welsh, with Cornish preserved as noted above. Breton, spoken in Brittany in France, is also derived from Brythonic, apparently largely due to a migration of Brythonic Celts to that peninsula at the time of the Anglo-Saxon incursions. The surviving Goiledic language is Gaelic, which is spoken in Western Ireland and taught throughout the Republic of Ireland, and in a separate dialect so distinct as to constitute effectively a separate language, spoken in the Western Isles and a few Highland areas in Scotland – hence known as Irish and Scots Gaelic respectively. Vannin (Manx) is preserved but not spoken on the Isle of Man. Cumbria, in northwesternmost England and adjacent Scotland, preserved a Brythonic language closely akin to Cymric until around the time of the Norman Conquest, give or take a century.
The Angles, Saxons, and Jutes spoke old West Germanic dialects related to Frisian, Dutch, Flemish, and Plattdeutsch, particularly the first of these. They colonized and/or took over the east coast of Britain and most of what is today’s England, except for Cumbria. The northern end of this incursion, originally the Kingdom of Bernicia, became the basis for the Scottish nation and Scottish as a separate language. The remainder preserved dialects that were mutually intelligible and which converged on English as one approached Elizabethan times.