*SET-U

English word origin

Etymology of Rex

Etymology tree Proto-Indo-European *h₃reǵ- Proto-Indo-European *-s Proto-Indo-European *h₃rḗǵs Proto-Italic *rēks Latin rēxbor. English Rex From Latin rēx (“king”). Doublet of rajah and roy.

1 source sectionExtended source reportWiktionary original ↗
In this entry · 1 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Unnumbered source etymology

Original entry ↗
name

The reigning king. · A male given name from Latin coined in the nineteenth century from Latin rex "king," rarely given today. · A popular name for a dog. · An unincorporated community in Clayton County, Georgia, United States.

Selected source glosses provide context, not a complete modern definition inventory

Etymology tree Proto-Indo-European *h₃reǵ- Proto-Indo-European *-s Proto-Indo-European *h₃rḗǵs Proto-Italic *rēks Latin rēxbor. English Rex From Latin rēx (“king”). Doublet of rajah and roy.

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Derivation mentionrēxla
  • Doublet mentionrajahen
  • Doublet mentionroyen

This page abbreviates 1 auxiliary source items. The etymology narrative is not shortened. Omission counts are available in the audit fields below; consult the original for complete auxiliary material.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":bor",
        "3": "la:rēx<id:king>",
        "id": "given name",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *h₃reǵ-\nProto-Indo-European *-s\nProto-Indo-European *h₃rḗǵs\nProto-Italic *rēks\nLatin rēxbor.\nEnglish Rex\n[Appendix:Glossary#loanword|Borrowed]] from\", \"terms\" : [ { \"id\" : \"king\", \"children\" : [ { \"terms\" : [ { \"id\" : \"king\", \"children\" : [ { \"terms\" : [ { \"id\" : \"king\", \"children\" : [ { \"terms\" : [ { \"id\" : \"to straighten\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*h₃reǵ-\", \"lang\" : \"ine-pro\" }, { \"id\" : \"lengthened acrostatic\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-s\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*h₃rḗǵs\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Italic\", \"term\" : \"*rēks\", \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Latin\", \"term\" : \"rēx\", \"lang\" : \"la\" } ], \"keyword\" : \"bor\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"Rex\", \"lang\" : \"en\" }\" data-id=\"given name\" data-lang=\"en\" data-title=\"Rex\" id=\"English:_given_name\">"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "rēx",
        "4": "",
        "5": "king"
      },
      "expansion": "Latin rēx (“king”)"
    },
    {
      "name": "doublet",
      "args": {
        "1": "en",
        "2": "rajah",
        "3": "roy"
      },
      "expansion": "Doublet of rajah and roy"
    },
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":bor",
        "3": "la:rēx<id:king>",
        "id": "given name",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *h₃reǵ-\nProto-Indo-European *-s\nProto-Indo-European *h₃rḗǵs\nProto-Italic *rēks\nLatin rēxbor.\nEnglish Rex"
    }
  ],
  "links": [
    [
      "*h₃reǵ-",
      "Reconstruction:Proto-Indo-European/h₃reǵ-#Proto-Indo-European:_to_straighten"
    ],
    [
      "*-s",
      "Reconstruction:Proto-Indo-European/-s#Proto-Indo-European:_lengthened_acrostatic"
    ],
    [
      "*h₃rḗǵs",
      "Reconstruction:Proto-Indo-European/h₃rḗǵs#Proto-Indo-European:_king"
    ],
    [
      "*rēks",
      "Reconstruction:Proto-Italic/rēks#Proto-Italic:_king"
    ],
    [
      "rēx",
      "rex#Latin:_king"
    ],
    [
      "rēx",
      "rex#Latin"
    ],
    [
      "rajah",
      "rajah#English"
    ],
    [
      "roy",
      "roy#English"
    ]
  ],
  "references": [],
  "descendants": [
    {
      "lang_code": "unknown",
      "lang": "(meaning that the King is the law)"
    },
    {
      "lang_code": "unknown",
      "lang": "(meaning that the King is not absolute but subject to the law)"
    }
  ],
  "lexical": [
    {
      "pos": "name",
      "glosses": [
        "The reigning king.",
        "A male given name from Latin coined in the nineteenth century from Latin rex \"king,\" rarely given today.",
        "A popular name for a dog.",
        "An unincorporated community in Clayton County, Georgia, United States."
      ],
      "tags": [
        "formal"
      ],
      "recordId": "11b05485393d116369c62ab8d19346efb28cbd19045d9c591e29e6304ff24740",
      "rawRecordSha256": "fb4f9b2a4e2297cf6f392204a82ff316a619b3a59620036ac2170561fdc76b60",
      "sourceRecordOrdinal": 332198
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 1,
    "glosses": 0
  }
}

Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for Rex →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-UmV4