Comments (Meaning / History Only)
Despite what Euskaltzaindia says, it is very likely that this name is a hypocorism of Unai. In Basque, adding an X at the end of a name is a common strategy for making diminutives (see https://revistas.navarra.es/index.php/FLV/article/view/2952/1860, page 5) [noted -ed]
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