Where does “Thom” come from?

Thom is an English given name derived from Latin Thomas, from Ancient Greek Θωμᾶς, from Aramaic תאומא, ultimately from Aramaic תאמא meaning twin.

Ancestry of “Thom”, step by step

Step	Language	Word	Meaning
1	English	Thomas	An infidel
2	Middle English	Thomas	—
3	Latin	Thōmās	—
4	Ancient Greek	Θωμᾶς	—
5	Aramaic	תאומא	twin; Thomas
6	Aramaic	תאמא	twin, double; Gemini

Thom — Etymology, Origin & Word History | Etymology Explorer