The only free and comprehensive online etymological dictionary of the Spanish language
seguir (Verb) "to continue," "to follow"
11th cent. From Vulgar Latin sequere, from Latin sequi 'id.' From Proto-Italic *sekw-e/o- 'id.' From Proto-Indo-European *sekw-e/o- 'id.'
Indo-European
Romance
Portuguese seguir, Catalan seguir, French suivre, suite, Italian seguire
Germanic
Old Irish sechithir "to follow," Germanic Gothic saiƕan "to see," Old Norse sjá 'id.,' Old High German sehan "to see," Old Saxon sehan 'id.,' English to see
Balto-Slavic
Lithuanian sèkti "to follow," Latvian sekt 'id.'
Hellenic
Ancient Greek ἕπομαι (hépomai) "to follow"
Indo-Iranian
Sanskrit sácate "to follow," Avestan haca- "to accompany"