"Allegheny County" meaning in English

{
  "etymology_text": "Named after the Allegheny River.",
  "head_templates": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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        {
          "kind": "place",
          "langcode": "en",
          "name": "Counties of Pennsylvania, USA",
          "orig": "en:Counties of Pennsylvania, USA",
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          "orig": "en:Places in Pennsylvania, USA",
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          "orig": "en:Places in the United States",
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      ],
      "glosses": [
        "One of 67 counties in Pennsylvania, United States. County seat: Pittsburgh."
      ],
      "id": "en-Allegheny_County-en-name-7XStKnfz",
      "links": [
        [
          "Pennsylvania",
          "Pennsylvania#English"
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        [
          "United States",
          "United States#English"
        ],
        [
          "Pittsburgh",
          "Pittsburgh#English"
        ]
      ],
      "related": [
        {
          "word": "Allegany County and Alleghany County"
        }
      ],
      "wikipedia": [
        "Allegheny County",
        "Allegheny River"
      ]
    }
  ],
  "word": "Allegheny County"
}

{
  "etymology_text": "Named after the Allegheny River.",
  "head_templates": [
    {
      "args": {
        "head": "Allegheny County"
      },
      "expansion": "Allegheny County",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "Allegany County and Alleghany County"
    }
  ],
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      "glosses": [
        "One of 67 counties in Pennsylvania, United States. County seat: Pittsburgh."
      ],
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        ]
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      "wikipedia": [
        "Allegheny County",
        "Allegheny River"
      ]
    }
  ],
  "word": "Allegheny County"
}