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Smith's Bible Dictionary
Thadde'us. One of the twelve apostles. Matthew 10:3; Mark 3:18. From a comparison, with the catalogue of St. Luke, Luke 6:16; Acts 1:13, it seems scarcely possible to doubt that the three names, of Judas, Lebbeus, and Thaddeus were borne by one and the same person. See Jude.
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Smith, William, Dr. Entry for 'Thaddeus'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/t/thaddeus.html. 1901.