Looks like I made the right guess from the name.
Accepted or traditional spellings of the Gaelic name DONOVAN:
Denovan
Danavan
Donevan
Donavon
Doniphan
Donivan
Donivin
Donovan
Donnavan
**Donnovan**
Donnovon
Dunnavan
Let’s try this for another Gaelic name, this time a woman’s:
SIOBHAN
Alternate spellings:
Chevonne
Shavawn
Shavonne
Shevon
Shevonne
Shevaun
Shivonne
I’m not saying that a lot of American blacks do not give their children ridiculous made-up names, but there are a lot of spelling variations for authentic names.