The only free and comprehensive online etymological dictionary of the Spanish language
llamar (Verb) "to call"
12th cent. Old Spanish llamar "to call," "to shout." From Latin clamare 'id.' Probably from a noun in Proto-Italic *klām-o/ā "shout." From Proto-Indo-European *kl̥h1-m- 'id.' From *kleh1- "to call."
Indo-European
Romance
Asturian llamar, Portuguese chamar, Galician chamar, Catalan clamar, French clamer, Italian chiamare, Aromanian cljem, Romanian chema, Sardinian ciamare
Italic
Latin calare "to call," Umbrian kar̆etu "he must call" (< Proto-Indo-European *kleh1-)
Germanic
Old Norse hjal "talk," Old High German hellan "to resound," Old Saxon halōn "to get," Old English hlōwan "to roar"
Balto-Slavic
Lithuanian kaļuôt "to talk idly"
Hellenic
Ancient Greek κᾰλεῖν (kaleîn) "to call"