Zelotes

Boyd’s Bible Dictionary:

(zealous). A name added to that of the apostle Simon to distinguish him from Simon Peter, and to emphasize his membership of the party of Zealots (Luke 6:1515Matthew and Thomas, James the son of Alpheus, and Simon called Zelotes, (Luke 6:15)). [SIMON, 4.]

Concise Bible Dictionary:

See SIMON No. 2.

Strong’s Dictionary of Greek Words:

Number:
2208 (find all occurrences in KJV Bible)
Greek:
Ζηλωτής
Transliteration:
Zelotes
Phonic:
dzay-lo-tace’
Meaning:
the same as 2207; a Zealot, i.e. (specially) partisan for Jewish political independence
KJV Usage:
Zelotes

Jackson’s Dictionary of Scripture Proper Names:

a zealot (especially for Jewish independence)

Potts’ Bible Proper Names:

Zealous; full of zeal; jealous:― applied to Simon, Luke 6:15. {Zelotes}