To expand on that a little bit, Ozanari probably means "Commonplace" or similar in this instance, though it can also mean "perfunctory" or "slapdash", but Commonplace Dungeon, or Everyday Dungeon sounds about right.
Nariyuki means progressive or additional, which would make sense as the first sequel series - Additional Dungeon.
Naozari is twofold. First, it's a pun since it's the characters of Ozanari rearranged, but also it means, loosely, "Negative", so, being the prequel, Negative Dungeon, or Minus Dungeon to contrast the sequel, Additional Dungeon.