If it is of Germanic origin it should be spelled with a K: Kleber. As far as I can see it is not used as a given name in Germany. As a surname it may have these derivations:
- Kleiber: a bird (nuthatch, sitta europea)
- "Kleber": "sticky", "glue", "someone who works with glue"
- from a
German place-name Kleba or Klebe
Especially the Brasilians are graet at making up first names, often taking them from surnames - why not Kleber …
Hope this helps
Andy