If you can provide the where you heard this name, I can narrow down the exact school for you.
Go to Google Maps, search "Dusun Nepong Pangandaran" . Look for a red school marker labeled SMP Negeri 1 Pangandaran . That is the real school behind the name "SMP Nyepong." SMP Nyepong
It is highly likely there is a or a confusion with a local nickname. The word Nyepong does not correspond to any standard Indonesian administrative village ( kelurahan/desa ) or common school abbreviation. If you can provide the where you heard
However, after searching through available educational databases, regional school registries (Dapodik), and general geographic references, in Indonesia. after searching through available educational databases