The name Columbus is a boy's name . Columbus and discussed in our forums with posts like "Rate the Previous Signature!".
From the experts:
This is a big name, both in heritage and sound. On the right child, this could be inspired, but others may shrink from all the connotations. While your preferred nickname for this option might be Col (or Kit if you're connecting it to Christopher Columbus), you may end up with the slightly more cumbersome "Bus" as the short-form.