▁Project ▁announced ▁an ▁online ▁program ▁called ▁" d AX un hy u uga ' ", ▁which ▁means ▁" the ▁words ▁of ▁the ▁people ." ▁ ▁Language ▁family ▁{{ main | Na - D ▁language ▁family ▁and ▁Na - Den é ▁larger ▁grouping , ▁which ▁includes ▁E y ak - A th ab ask an ▁and ▁T ling it ▁with ▁a ▁controvers ial ▁but ▁possible ▁inclusion ▁of ▁Ha ida . ▁The ▁Ath ab ask an ▁family ▁covers ▁three ▁distinct ▁ge ographic ▁areas , ▁forming ▁three ▁sub groups : ▁Northern ▁Ath ab ask an ▁in ▁Al aska ▁and ▁the ▁Y uk on ; ▁Pacific ▁Coast ▁Ath ab ask an ▁in ▁California ▁and ▁Oregon ; ▁and ▁Southern ▁Ath ab ask an , ▁also ▁called ▁Apache , ▁spoken ▁mainly ▁in ▁the ▁American ▁South west , ▁which ▁includes ▁N ava jo . ▁There ▁has ▁been ▁extensive ▁compar ative ▁reconst ruction ▁of ▁a ▁Pro to - A th ab ask an - E y ak ▁( PA E ). ▁A ▁recent ▁proposal ▁of ▁a ▁Den é – Y en ise ian ▁stock ▁has ▁been ▁widely ▁well ▁received ▁by ▁lingu ists , ▁linking ▁the ▁Den é ▁languages ▁to ▁the ▁Y en ise ian ▁languages ▁of ▁central ▁Si ber ia . ▁If ▁it ▁proves ▁correct , ▁it ▁will ▁be ▁the ▁first ▁valid ated ▁gen etic ▁link ▁between ▁Old ▁and ▁New ▁World ▁languages . ▁Far ▁less ▁accepted ▁is ▁a ▁possible ▁Den é – C au cas ian ▁stock ▁that ▁has ▁been ▁purs ued ▁for ▁dec ades . ▁ ▁Ph on ology ▁The