"Taf" meaning in Welsh

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "cel",
        "3": "-"
      },
      "expansion": "Celtic",
      "name": "der"
    }
  ],
  "etymology_text": "Likely from the same Celtic source of the rivers Tafwys, Teifi, Dyfi, Tawe, from a root meaning \"dark\" or \"water.\" Also see Thames.",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cy-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "Taf",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "Daf",
      "source": "mutation",
      "tags": [
        "soft"
      ]
    },
    {
      "form": "Nhaf",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "Thaf",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "proper noun"
      },
      "expansion": "Taf",
      "name": "head"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "cy-mut"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "cy",
          "name": "Rivers in Wales",
          "orig": "cy:Rivers in Wales",
          "parents": [
            "Rivers",
            "Places",
            "Bodies of water",
            "Names",
            "Landforms",
            "Water",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Earth",
            "Liquids",
            "Fundamental",
            "Nouns",
            "Nature",
            "Matter",
            "Lemmas",
            "Chemistry",
            "Sciences"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "Rhondda Cynon Taf"
        }
      ],
      "glosses": [
        "River Taff"
      ],
      "id": "en-Taf-cy-name-RO5mS5AZ",
      "links": [
        [
          "Taff",
          "Taff"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/taːv/"
    }
  ],
  "word": "Taf"
}

{
  "derived": [
    {
      "word": "Rhondda Cynon Taf"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "cel",
        "3": "-"
      },
      "expansion": "Celtic",
      "name": "der"
    }
  ],
  "etymology_text": "Likely from the same Celtic source of the rivers Tafwys, Teifi, Dyfi, Tawe, from a root meaning \"dark\" or \"water.\" Also see Thames.",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cy-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "Taf",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "Daf",
      "source": "mutation",
      "tags": [
        "soft"
      ]
    },
    {
      "form": "Nhaf",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "Thaf",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "proper noun"
      },
      "expansion": "Taf",
      "name": "head"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "cy-mut"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Welsh entries with incorrect language header",
        "Welsh lemmas",
        "Welsh proper nouns",
        "Welsh terms derived from Celtic languages",
        "cy:Rivers in Wales"
      ],
      "glosses": [
        "River Taff"
      ],
      "links": [
        [
          "Taff",
          "Taff"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/taːv/"
    }
  ],
  "word": "Taf"
}

{
  "called_from": "inflection/865",
  "msg": "inflection table: IF WITHOUT ELSE EVALS False: Taf/Welsh 'radical' base_tags=set()",
  "path": [
    "Taf"
  ],
  "section": "Welsh",
  "subsection": "proper noun",
  "title": "Taf",
  "trace": ""
}

{
  "called_from": "inflection/865",
  "msg": "inflection table: IF WITHOUT ELSE EVALS False: Taf/Welsh 'nasal' base_tags={'soft', 'error-unrecognized-form'}",
  "path": [
    "Taf"
  ],
  "section": "Welsh",
  "subsection": "proper noun",
  "title": "Taf",
  "trace": ""
}

{
  "called_from": "inflection/865",
  "msg": "inflection table: IF WITHOUT ELSE EVALS False: Taf/Welsh 'aspirate' base_tags={'soft', 'error-unrecognized-form'}",
  "path": [
    "Taf"
  ],
  "section": "Welsh",
  "subsection": "proper noun",
  "title": "Taf",
  "trace": ""
}