From the Super Mario Wiki
Oerlikons are purple relatives to Spinies found only in Super Mario RPG: Legend of the Seven Stars. They are found in Barrel Volcano. They are a color swap of Spikeys and Spikesters, and are bipedal Spinies. They are the strongest sub-species of Spikeys.
Names in other languages
|From uni, meaning "sea urchin", and hei, which is used in the Japanese name for Shy Guys and Bob-ombs. Hei can also mean "soldier".
- Oerlikons are most likely named after Oerlikon Contraves, a Swiss anti-aircraft artillery manufacturer and its most famous product, the Oerlikon 20 mm anti-aircraft gun. The naming choice is probably explained by Oerlikons' spikes being capable to stop Mario's jumping attacks, thus acting as air defence in a way.