- Oak — Space & Nature Alpaca Names
- Oakley — Names for Brown Alpacas
- Obsidian — Names for Black Alpacas
- Olive — Food-Inspired Alpaca Names
- Olivia — Female Alpaca Names
- Ollantay — Place in Peru · Peruvian Place Names for Alpacas
- Ollie — Male Alpaca Names
- Onyx — Names for Black Alpacas
- Opal — Names for White Alpacas
- Ophelia — Female Alpaca Names
- Oreo — Food-Inspired Alpaca Names
- Orion — Names for Black Alpacas
- Oro — gold · Spanish Alpaca Names
- Oscar — Male Alpaca Names
- Otis — Male Alpaca Names