"Jac" meaning in Welsh

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "en",
        "3": "Jack"
      },
      "expansion": "Borrowed from English Jack",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from English Jack.",
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "Jac m (not mutable)",
      "name": "cy-proper noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh given names",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh male given names",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "a male given name, equivalent to English Jack"
      ],
      "id": "en-Jac-cy-name-Na0zfaNC",
      "links": [
        [
          "given name",
          "given name"
        ],
        [
          "Jack",
          "Jack#English"
        ]
      ],
      "tags": [
        "masculine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/d͡ʒak/"
    },
    {
      "rhymes": "-ak"
    }
  ],
  "word": "Jac"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "en",
        "3": "Jack"
      },
      "expansion": "Borrowed from English Jack",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from English Jack.",
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "Jac m (not mutable)",
      "name": "cy-proper noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Rhymes:Welsh/ak",
        "Rhymes:Welsh/ak/1 syllable",
        "Welsh entries with incorrect language header",
        "Welsh given names",
        "Welsh lemmas",
        "Welsh male given names",
        "Welsh masculine nouns",
        "Welsh non-mutable terms",
        "Welsh proper nouns",
        "Welsh terms borrowed from English",
        "Welsh terms derived from English",
        "Welsh terms spelled with J"
      ],
      "glosses": [
        "a male given name, equivalent to English Jack"
      ],
      "links": [
        [
          "given name",
          "given name"
        ],
        [
          "Jack",
          "Jack#English"
        ]
      ],
      "tags": [
        "masculine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/d͡ʒak/"
    },
    {
      "rhymes": "-ak"
    }
  ],
  "word": "Jac"
}