The only free and comprehensive online etymological dictionary of the Spanish language
llegar (Verb) "to arrive"
12th cent. From Latin plicare "to fold." According to Roberts (2014), an extension of the sense of being 'folded' into something as an arrival at a destination. From Proto-Italic *plek- 'id.' From Proto-Indo-European *pleḱ- 'id.'
Indo-European
Romance
Asturian llegar, Portuguese chegar, Catalan plegar, French plier, Italian piegare, Aromanian plec, Romanian pleca, Sardinian pigiàre
Germanic
Old Norse flétta "to plait," Old High German flehtan, Old English fleohtan 'id.'
Balto-Slavic
Old Church Slavonic plesti "to plait," Russian plestí 'id.'
Hellenic
Ancient Greek πλέκειν (plékein) "to braid"
Indo-Iranian
Sanskrit praśna- "turban," Young Avestan -frašna- "helm," "mail"