*aigin

Possibly from a Proto-Indo-European root *h₂eyḱ-, also underlying *aiglaz. The exact formation is uncertain. (Kroonen 2013: 9) tentatively reconstructs an *nt-formation *h₂eyḱ-ént, which would phonologically account well for a dental stem *aiginþ-, but a regular athematic active participle would be expected to have a zero-grade root and the suffixal alternation *-ónt- ~ -n̥t-. The Germanic evidence does not securely establish a paradigm *aigin ~ *aiginþ-: Old Norse eigin lacks the dental, while dental forms in Norwegian and Swedish may reflect a secondary derivative **aigindja-. An early split between a direct form without a dental and an oblique dental stem is possible, but speculative. Compare Latin ī̆cō, Mycenaean Greek 𐁁𐀏𐀭𐀔 (a3-ka-sa-ma /⁠*aiksmans⁠/), and Ancient Greek αἰχμή (aikhmḗ) for the root (Beekes 2010: 45–46; de Vaan 2008: 295).