The letters CO can represent several different things:
Co (small O) is the element symbol for cobalt.
Co. (with period) is the abbreviation for "Company" in a company name.
CO (capitals) is the abbreviation for the state of Colorado.
CO (chemical compound) is carbon monoxide, a poisonous gas.
co-lessee
co owner
co-ordinator is the older spelling. Today, "coordinator" is the preferred spelling.
cofounder
That is the correct spelling of "co-owner" (one of the owners).
coordinate. the hyphen is no longer necessary.
That is a proper spelling of "co-chairman" (one of two or more joint chairmen).
cell wall
The spelling may be one word "cofounder" or hyphenated "co-founder" (which is sometimes clearer).
That is one correct spelling for project co-ordinator. It can also be spelt as project coordinator.
The correct spelling is: Vaya con dios
Ballinrobe, as you have it in your question, is the correct spelling.