The genitive of "tigh", house? The name Tadhg?
Rebekah is not a Gaelic name and therefore doesn't mean anything in Gaelic.
It is not a Gaelic word. Gaelic has no K.
Mary Tighe died in 1810.
James Tighe was born in 1982.
Ambrose Tighe died in 1928.
Ambrose Tighe was born in 1859.
Jack Tighe was born in 1913.
Jack Tighe died in 2002.
Kelly Tighe is 5' 3".
Roy Tighe is 5' 10".
There is no Gaelic form of the name, if that's what you mean.
Crazzy doesn't mean anything in Gaelic.