"marsna" meaning in Old Dutch

{
  "etymology_templates": [
    {
      "args": {
        "1": "odt"
      },
      "expansion": "Unknown",
      "name": "unk"
    },
    {
      "args": {
        "1": "odt",
        "2": "qfa-sub",
        "3": "-"
      },
      "expansion": "substrate",
      "name": "der"
    }
  ],
  "etymology_text": "Unknown. Often connected to *marisk (“marsh”) or its source *mari (“sea”), but this is doubtful, and the suffix -sna is otherwise unattested in late Germanic. The name could be of non-Germanic substrate origin.",
  "head_templates": [
    {
      "args": {
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        "2": "noun",
        "cat2": "",
        "g": "?",
        "g2": "",
        "g3": "",
        "head": "",
        "sort": ""
      },
      "expansion": "marsna ?",
      "name": "head"
    },
    {
      "args": {
        "1": ""
      },
      "expansion": "marsna ?",
      "name": "odt-noun"
    }
  ],
  "lang": "Old Dutch",
  "lang_code": "odt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Dutch entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "odt",
          "name": "Places in Utrecht, Netherlands",
          "orig": "odt:Places in Utrecht, Netherlands",
          "parents": [
            "Places"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "odt",
          "name": "Places in the Netherlands",
          "orig": "odt:Places in the Netherlands",
          "parents": [
            "Places"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "odt",
          "name": "Villages in Utrecht, Netherlands",
          "orig": "odt:Villages in Utrecht, Netherlands",
          "parents": [
            "Villages",
            "Places"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "odt",
          "name": "Villages in the Netherlands",
          "orig": "odt:Villages in the Netherlands",
          "parents": [
            "Villages",
            "Places"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Maarssen (a village in modern Utrecht, the Netherlands)"
      ],
      "id": "en-marsna-odt-noun-xY65aO1Z",
      "links": [
        [
          "Maarssen",
          "Maarssen#English"
        ],
        [
          "village",
          "village"
        ],
        [
          "Utrecht",
          "Utrecht#English"
        ],
        [
          "Netherlands",
          "Netherlands#English"
        ]
      ]
    }
  ],
  "word": "marsna"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "odt"
      },
      "expansion": "Unknown",
      "name": "unk"
    },
    {
      "args": {
        "1": "odt",
        "2": "qfa-sub",
        "3": "-"
      },
      "expansion": "substrate",
      "name": "der"
    }
  ],
  "etymology_text": "Unknown. Often connected to *marisk (“marsh”) or its source *mari (“sea”), but this is doubtful, and the suffix -sna is otherwise unattested in late Germanic. The name could be of non-Germanic substrate origin.",
  "head_templates": [
    {
      "args": {
        "1": "odt",
        "2": "noun",
        "cat2": "",
        "g": "?",
        "g2": "",
        "g3": "",
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      },
      "expansion": "marsna ?",
      "name": "head"
    },
    {
      "args": {
        "1": ""
      },
      "expansion": "marsna ?",
      "name": "odt-noun"
    }
  ],
  "lang": "Old Dutch",
  "lang_code": "odt",
  "pos": "noun",
  "senses": [
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        "Old Dutch entries with incorrect language header",
        "Old Dutch lemmas",
        "Old Dutch nouns",
        "Old Dutch terms derived from substrate languages",
        "Old Dutch terms with unknown etymologies",
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        "Pages with entries",
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        "odt:Places in the Netherlands",
        "odt:Villages in Utrecht, Netherlands",
        "odt:Villages in the Netherlands"
      ],
      "glosses": [
        "Maarssen (a village in modern Utrecht, the Netherlands)"
      ],
      "links": [
        [
          "Maarssen",
          "Maarssen#English"
        ],
        [
          "village",
          "village"
        ],
        [
          "Utrecht",
          "Utrecht#English"
        ],
        [
          "Netherlands",
          "Netherlands#English"
        ]
      ]
    }
  ],
  "word": "marsna"
}