Correct spelling for the English word "keirn" is [kˈe͡ən], [kˈeən], [k_ˈeə_n] (IPA phonetic alphabet).
The word "keirn" has its origins in Old English. It is derived from the Old English word "cyrne", which meant churn or vessel for churning. Over time, "cyrne" transformed into "kirne" and later into "keirn". The word ultimately refers to a churn or the act of churning butter.