"Cynon" meaning in Gallois

{
  "categories": [
    {
      "kind": "other",
      "name": "Noms propres en gallois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Gallois",
      "orig": "gallois",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "Abercynon"
    },
    {
      "word": "Cwm Cynon"
    }
  ],
  "forms": [
    {
      "form": "Gynon",
      "raw_tags": [
        "Lénition"
      ]
    },
    {
      "form": "Nghynon",
      "raw_tags": [
        "Nasalisation"
      ]
    },
    {
      "form": "Chynon",
      "raw_tags": [
        "Spirantisation"
      ]
    }
  ],
  "lang": "Gallois",
  "lang_code": "cy",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Cours d’eau du Pays de Galles en gallois",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en gallois",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Cynon."
      ],
      "id": "fr-Cynon-cy-name-RndF1PJb",
      "topics": [
        "geography"
      ]
    }
  ],
  "word": "Cynon"
}

{
  "categories": [
    "Noms propres en gallois",
    "gallois"
  ],
  "derived": [
    {
      "word": "Abercynon"
    },
    {
      "word": "Cwm Cynon"
    }
  ],
  "forms": [
    {
      "form": "Gynon",
      "raw_tags": [
        "Lénition"
      ]
    },
    {
      "form": "Nghynon",
      "raw_tags": [
        "Nasalisation"
      ]
    },
    {
      "form": "Chynon",
      "raw_tags": [
        "Spirantisation"
      ]
    }
  ],
  "lang": "Gallois",
  "lang_code": "cy",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "categories": [
        "Cours d’eau du Pays de Galles en gallois",
        "Wiktionnaire:Exemples manquants en gallois"
      ],
      "glosses": [
        "Cynon."
      ],
      "topics": [
        "geography"
      ]
    }
  ],
  "word": "Cynon"
}