"Ó Cathaláin" meaning in Irish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "O'Culhane"
          },
          "expansion": "English: O'Culhane",
          "name": "desc"
        }
      ],
      "text": "English: O'Culhane"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "ga",
        "2": "sga",
        "3": "Cathal"
      },
      "expansion": "Old Irish Cathal",
      "name": "inh"
    },
    {
      "args": {
        "1": "ga",
        "2": "cel-pro",
        "3": "*Katuwalos",
        "4": "",
        "5": "strong in battle"
      },
      "expansion": "Proto-Celtic *Katuwalos (“strong in battle”)",
      "name": "inh"
    }
  ],
  "etymology_text": "Ó (“grandchild, descendant”) + the personal name Cathaláin, a diminutive of Old Irish Cathal itself from Proto-Celtic *Katuwalos (“strong in battle”).",
  "forms": [
    {
      "form": "Uí Chathaláin",
      "tags": [
        "genitive"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "10": "",
        "2": "proper noun",
        "3": "genitive",
        "4": "Uí Chathaláin",
        "5": "",
        "6": "",
        "7": "",
        "8": "",
        "9": "",
        "f1request": "1",
        "f4request": "1",
        "g": "m",
        "g2": "",
        "g3": "",
        "head": ""
      },
      "expansion": "Ó Cathaláin m (genitive Uí Chathaláin)",
      "name": "head"
    },
    {
      "args": {
        "1": "m",
        "2": "Uí Chathaláin"
      },
      "expansion": "Ó Cathaláin m (genitive Uí Chathaláin)",
      "name": "ga-proper noun"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Irish entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Irish male surnames",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Irish surnames",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "a male surname, feminine equivalent Ní Chathaláin"
      ],
      "id": "en-Ó_Cathaláin-ga-name-jTu38KiB",
      "links": [
        [
          "surname",
          "surname"
        ],
        [
          "Ní Chathaláin",
          "Ní Chathaláin#Irish"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "Ó Cathaláin"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "O'Culhane"
          },
          "expansion": "English: O'Culhane",
          "name": "desc"
        }
      ],
      "text": "English: O'Culhane"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "ga",
        "2": "sga",
        "3": "Cathal"
      },
      "expansion": "Old Irish Cathal",
      "name": "inh"
    },
    {
      "args": {
        "1": "ga",
        "2": "cel-pro",
        "3": "*Katuwalos",
        "4": "",
        "5": "strong in battle"
      },
      "expansion": "Proto-Celtic *Katuwalos (“strong in battle”)",
      "name": "inh"
    }
  ],
  "etymology_text": "Ó (“grandchild, descendant”) + the personal name Cathaláin, a diminutive of Old Irish Cathal itself from Proto-Celtic *Katuwalos (“strong in battle”).",
  "forms": [
    {
      "form": "Uí Chathaláin",
      "tags": [
        "genitive"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "10": "",
        "2": "proper noun",
        "3": "genitive",
        "4": "Uí Chathaláin",
        "5": "",
        "6": "",
        "7": "",
        "8": "",
        "9": "",
        "f1request": "1",
        "f4request": "1",
        "g": "m",
        "g2": "",
        "g3": "",
        "head": ""
      },
      "expansion": "Ó Cathaláin m (genitive Uí Chathaláin)",
      "name": "head"
    },
    {
      "args": {
        "1": "m",
        "2": "Uí Chathaláin"
      },
      "expansion": "Ó Cathaláin m (genitive Uí Chathaláin)",
      "name": "ga-proper noun"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Irish entries with incorrect language header",
        "Irish lemmas",
        "Irish male surnames",
        "Irish masculine nouns",
        "Irish multiword terms",
        "Irish proper nouns",
        "Irish surnames",
        "Irish terms derived from Old Irish",
        "Irish terms derived from Proto-Celtic",
        "Irish terms inherited from Old Irish",
        "Irish terms inherited from Proto-Celtic",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "a male surname, feminine equivalent Ní Chathaláin"
      ],
      "links": [
        [
          "surname",
          "surname"
        ],
        [
          "Ní Chathaláin",
          "Ní Chathaláin#Irish"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "Ó Cathaláin"
}