"Sergei" meaning in Estonian

{
  "head_templates": [
    {
      "args": {
        "1": "et",
        "2": "proper noun"
      },
      "expansion": "Sergei",
      "name": "head"
    }
  ],
  "lang": "Estonian",
  "lang_code": "et",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Estonian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Estonian renderings of Russian male given names",
          "parents": [
            "Male given names",
            "Given names",
            "Names",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A transliteration of the Russian male given name Серге́й (Sergéj), equivalent to Sergius."
      ],
      "id": "en-Sergei-et-name-ZaELBCjm",
      "links": [
        [
          "Серге́й",
          "Сергей#Russian"
        ],
        [
          "Sergius",
          "Sergius#English"
        ]
      ]
    }
  ],
  "word": "Sergei"
}

{
  "head_templates": [
    {
      "args": {
        "1": "et",
        "2": "proper noun"
      },
      "expansion": "Sergei",
      "name": "head"
    }
  ],
  "lang": "Estonian",
  "lang_code": "et",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Estonian entries with incorrect language header",
        "Estonian lemmas",
        "Estonian proper nouns",
        "Estonian renderings of Russian male given names",
        "Estonian terms borrowed from Russian",
        "Estonian terms derived from Russian"
      ],
      "glosses": [
        "A transliteration of the Russian male given name Серге́й (Sergéj), equivalent to Sergius."
      ],
      "links": [
        [
          "Серге́й",
          "Сергей#Russian"
        ],
        [
          "Sergius",
          "Sergius#English"
        ]
      ]
    }
  ],
  "word": "Sergei"
}