"Ní" meaning in Irish

{
  "etymology_text": "Contracted from iníon uí (“daughter of the descendant of”).",
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "noun"
      },
      "expansion": "Ní",
      "name": "head"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Deirdre Ní Cheallaigh – literally \"Deirdre, daughter of a descendant of Ceallach\" (anglicized form Deirdre Kelly)"
        }
      ],
      "glosses": [
        "A prefix used with a woman's maiden surname"
      ],
      "id": "en-Ní-ga-noun-oGxCW2Dg",
      "related": [
        {
          "english": "used in male names",
          "word": "Ó"
        },
        {
          "word": "bean Uí"
        },
        {
          "english": "used with a woman's married name",
          "word": "Uí"
        },
        {
          "english": "used in place of the male Mac prefix",
          "word": "Nic"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nʲiː]"
    }
  ],
  "word": "Ní"
}

{
  "etymology_text": "Contracted from iníon uí (“daughter of the descendant of”).",
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "noun"
      },
      "expansion": "Ní",
      "name": "head"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "noun",
  "related": [
    {
      "english": "used in male names",
      "word": "Ó"
    },
    {
      "word": "bean Uí"
    },
    {
      "english": "used with a woman's married name",
      "word": "Uí"
    },
    {
      "english": "used in place of the male Mac prefix",
      "word": "Nic"
    }
  ],
  "senses": [
    {
      "categories": [
        "Irish entries with incorrect language header",
        "Irish lemmas",
        "Irish nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "Deirdre Ní Cheallaigh – literally \"Deirdre, daughter of a descendant of Ceallach\" (anglicized form Deirdre Kelly)"
        }
      ],
      "glosses": [
        "A prefix used with a woman's maiden surname"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nʲiː]"
    }
  ],
  "word": "Ní"
}