'Such' is Old English for 'so-like' — a fusion of 'swa' (so) + 'lic' (form). Literally 'of that shape.'
Of the type previously mentioned or about to be mentioned; to so great a degree.
From Old English 'swylc, swilc' (of that kind, such), a compound of 'swā' (so, as) + '-līc' (like, having the form of), literally 'so-like, of such a form.' The 'swā' element descends from PIE *swé (self, own), a reflexive pronoun root that produced Latin 'suus' (one's own), Sanskrit स्व (svá, own, self), Greek ἑ (hé, himself), and Gothic 'swē' (so, as). The '-līc' component derives from Proto-Germanic *līką (body, form, likeness), related to 'like' and German 'gleich' (alike, equal) and Old Norse 'líkr' (similar). The compound mirrors similar