"намъ" meaning in Old East Slavic

{
  "etymology_templates": [
    {
      "args": {
        "1": "orv",
        "2": "sla-pro",
        "3": "*namъ"
      },
      "expansion": "Proto-Slavic *namъ",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *namъ.",
  "forms": [
    {
      "form": "namŭ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "orv",
        "2": "pronoun form"
      },
      "expansion": "намъ (namŭ)",
      "name": "head"
    }
  ],
  "lang": "Old East Slavic",
  "lang_code": "orv",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old East Slavic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "my, “we”",
          "word": "мꙑ"
        }
      ],
      "glosses": [
        "dative of мꙑ (my, “we”)"
      ],
      "id": "en-намъ-orv-pron-eZU7SbJF",
      "links": [
        [
          "мꙑ",
          "мꙑ#Old_East_Slavic"
        ]
      ],
      "tags": [
        "dative",
        "form-of"
      ]
    }
  ],
  "word": "намъ"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "orv",
        "2": "sla-pro",
        "3": "*namъ"
      },
      "expansion": "Proto-Slavic *namъ",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *namъ.",
  "forms": [
    {
      "form": "namŭ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "orv",
        "2": "pronoun form"
      },
      "expansion": "намъ (namŭ)",
      "name": "head"
    }
  ],
  "lang": "Old East Slavic",
  "lang_code": "orv",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Old East Slavic entries with incorrect language header",
        "Old East Slavic non-lemma forms",
        "Old East Slavic pronoun forms",
        "Old East Slavic terms derived from Proto-Slavic",
        "Old East Slavic terms inherited from Proto-Slavic",
        "Pages with 4 entries",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "my, “we”",
          "word": "мꙑ"
        }
      ],
      "glosses": [
        "dative of мꙑ (my, “we”)"
      ],
      "links": [
        [
          "мꙑ",
          "мꙑ#Old_East_Slavic"
        ]
      ],
      "tags": [
        "dative",
        "form-of"
      ]
    }
  ],
  "word": "намъ"
}