Etymology
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Words related to cogito ergo sum

Cartesian (adj.)
pertaining to the works or ideas of French philosopher and mathematician René Descartes (1596-1650), 1650s, from Cartesius, the Latinized form of his surname (regarded as Des Cartes) + -ian. In addition to his philosophy (based on the fundamental principle cogito, ergo sum), he developed a system of coordinates for determining the positions of points on a plane.
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cogitation (n.)

c. 1200, cogitacioun, "thought, idea, notion, that which is thought out; act of thinking, earnest reflection," from Old French cogitacion "thought, consideration, reflection," from Latin cogitationem (nominative cogitatio), noun of action from past participle stem of cogitare "to think, reflect, consider, turn over in the mind," which is apparently a contraction of co-agitare, from assimilated form of com "together" (see co-) + agitare, here in a sense of "to turn over in the mind," literally "to put in constant motion, drive, impel," frequentative of agere "to move, drive" (from PIE root *ag- "to drive, draw out or forth, move").

ergo (conj.)
c. 1400, from Latin ergo "therefore, in consequence of," possibly contracted from *e rogo "from the direction of," from ex "out of" (see ex-) + noun from regere "to direct, to guide" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule"). Used in logic to introduce the conclusion of a complete and necessary syllogism.
*es- 

Proto-Indo-European root meaning "to be."

It forms all or part of: absence; absent; am; Bodhisattva; entity; essence; essential; essive; eu-; eucalyptus; Eucharist; Euclidean; Eudora; Eugene; eugenics; eulogy; Eunice; euphemism; euphoria; euthanasia; homoiousian; improve; interest; is; onto-; Parousia; present (adj.) "existing at the time;" present (n.2) "what is offered or given as a gift;" proud; quintessence; represent; satyagraha; sin; sooth; soothe; suttee; swastika; yes.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit asmi, Hittite eimi, Greek esti-, Latin est, Old Church Slavonic jesmi, Lithuanian esmi, Gothic imi, Old English eom, German ist.