The liar Daniel Cassidy, in his ridiculous attempt to ‘queer the pitch’ of Irish linguistics, How The Irish Invented Slang, claimed that the word queer was of Irish origin.
As usual with Cassidy’s claims, this is fanciful, childish nonsense. The word queer is first recorded in English about 1500. It is thought to be derived from Scots and to be a cognate of the German quer, which means ‘oblique, perverse, odd’. It acquired the modern meaning (originally pejorative but now reclaimed by gay and lesbian activists) of ‘gay’ in the 20th century.
Cassidy derives it from the Irish word corr, meaning odd. The problem is that corr doesn’t sound anything like queer. It is pronounced kor or kore.
This is just another bit of stupid made-up nonsense from the pole-nosed Pinocchio of Irish Studies.