I can put you in touch with a whole bunch of Keenas - all my cousins. I don't remember what I posted in my first message to this board, but my mother's maiden name is Keena. She is the eldest of five - 3 girls and two boys. Her dad was born in this country of Irish parents, and moved back to Dublin at the beginning of the 20th century. He married my grandmother, who was a Kelly, and they moved to this country in 1928.
It does seem to be a relatively small family, but (and I may have said this before) there are a bunch of Keenas in the Detroit, MI, phone book.