"Γιαννιού" meaning in Greek

{
  "forms": [
    {
      "form": "Giannioú",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proper noun form",
        "g": "m"
      },
      "expansion": "Γιαννιού • (Giannioú) m",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "Giánnis",
          "word": "Γιάννης"
        }
      ],
      "glosses": [
        "Genitive singular form of Γιάννης (Giánnis)."
      ],
      "id": "en-Γιαννιού-el-name-P3YO7Qm6",
      "links": [
        [
          "Genitive",
          "genitive"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "Γιάννης",
          "Γιάννης#Greek"
        ]
      ],
      "raw_glosses": [
        "(colloquial) Genitive singular form of Γιάννης (Giánnis)."
      ],
      "tags": [
        "colloquial",
        "form-of",
        "genitive",
        "singular"
      ]
    }
  ],
  "word": "Γιαννιού"
}

{
  "forms": [
    {
      "form": "Giannioú",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proper noun form",
        "g": "m"
      },
      "expansion": "Γιαννιού • (Giannioú) m",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Greek colloquialisms",
        "Greek entries with incorrect language header",
        "Greek non-lemma forms",
        "Greek proper noun forms"
      ],
      "form_of": [
        {
          "extra": "Giánnis",
          "word": "Γιάννης"
        }
      ],
      "glosses": [
        "Genitive singular form of Γιάννης (Giánnis)."
      ],
      "links": [
        [
          "Genitive",
          "genitive"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "Γιάννης",
          "Γιάννης#Greek"
        ]
      ],
      "raw_glosses": [
        "(colloquial) Genitive singular form of Γιάννης (Giánnis)."
      ],
      "tags": [
        "colloquial",
        "form-of",
        "genitive",
        "singular"
      ]
    }
  ],
  "word": "Γιαννιού"
}