"Bretnas" meaning in Old Irish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "Breatnais"
          },
          "expansion": "Irish: Breatnais",
          "name": "desc"
        }
      ],
      "text": "Irish: Breatnais"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gv",
            "2": "Bretnish"
          },
          "expansion": "Manx: Bretnish",
          "name": "desc"
        }
      ],
      "text": "Manx: Bretnish"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gd",
            "2": "Breatannais"
          },
          "expansion": "Scottish Gaelic: Breatannais",
          "name": "desc"
        }
      ],
      "text": "Scottish Gaelic: Breatannais"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "Bretain",
        "3": "-as"
      },
      "expansion": "Bretain + -as",
      "name": "af"
    }
  ],
  "etymology_text": "* Bretain + -as",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "sga-mutation",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "Bretnas",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "Bretnas",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-nasal"
      ]
    },
    {
      "form": "mBretnas",
      "source": "mutation",
      "tags": [
        "mutation"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "proper noun",
        "g": "f"
      },
      "expansion": "Bretnas f",
      "name": "head"
    }
  ],
  "inflection_templates": [
    {
      "args": {
        "1": "B",
        "2": "retnas"
      },
      "name": "sga-mutation"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old Irish entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "sga",
          "name": "Languages",
          "orig": "sga:Languages",
          "parents": [
            "Language",
            "Names",
            "Communication",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "the Welsh language"
      ],
      "id": "en-Bretnas-sga-name-QSKaUJku",
      "links": [
        [
          "Welsh",
          "Welsh"
        ]
      ],
      "related": [
        {
          "word": "Bretain"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "Bretnas"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "Breatnais"
          },
          "expansion": "Irish: Breatnais",
          "name": "desc"
        }
      ],
      "text": "Irish: Breatnais"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gv",
            "2": "Bretnish"
          },
          "expansion": "Manx: Bretnish",
          "name": "desc"
        }
      ],
      "text": "Manx: Bretnish"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gd",
            "2": "Breatannais"
          },
          "expansion": "Scottish Gaelic: Breatannais",
          "name": "desc"
        }
      ],
      "text": "Scottish Gaelic: Breatannais"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "Bretain",
        "3": "-as"
      },
      "expansion": "Bretain + -as",
      "name": "af"
    }
  ],
  "etymology_text": "* Bretain + -as",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "sga-mutation",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "Bretnas",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "Bretnas",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-nasal"
      ]
    },
    {
      "form": "mBretnas",
      "source": "mutation",
      "tags": [
        "mutation"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "proper noun",
        "g": "f"
      },
      "expansion": "Bretnas f",
      "name": "head"
    }
  ],
  "inflection_templates": [
    {
      "args": {
        "1": "B",
        "2": "retnas"
      },
      "name": "sga-mutation"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "name",
  "related": [
    {
      "word": "Bretain"
    }
  ],
  "senses": [
    {
      "categories": [
        "Old Irish entries with incorrect language header",
        "Old Irish entries with topic categories using raw markup",
        "Old Irish feminine nouns",
        "Old Irish lemmas",
        "Old Irish proper nouns",
        "sga:Languages"
      ],
      "glosses": [
        "the Welsh language"
      ],
      "links": [
        [
          "Welsh",
          "Welsh"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "Bretnas"
}