"маттѣи" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Prénoms masculins en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "name",
  "pos_title": "Prénom",
  "related": [
    {
      "word": "матътєи"
    },
    {
      "word": "матѳєи"
    }
  ],
  "senses": [
    {
      "glosses": [
        "Mathieu."
      ],
      "id": "fr-маттѣи-cu-name-T8ACz9G1"
    }
  ],
  "tags": [
    "first name",
    "masculine"
  ],
  "word": "маттѣи"
}

{
  "categories": [
    "Prénoms masculins en vieux slave",
    "vieux slave"
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "name",
  "pos_title": "Prénom",
  "related": [
    {
      "word": "матътєи"
    },
    {
      "word": "матѳєи"
    }
  ],
  "senses": [
    {
      "glosses": [
        "Mathieu."
      ]
    }
  ],
  "tags": [
    "first name",
    "masculine"
  ],
  "word": "маттѣи"
}