From Proto-Basque *(h)altza (compare Basque haltza). *<span class="searchmatch">hals</span> alder Known from <span class="searchmatch">Aquitanian</span> inscriptions Koldo Luis Mitxelena...
Perhaps related to Proto-Germanic *alizō. *(h)altza alder <span class="searchmatch">Aquitanian</span>: *<span class="searchmatch">hals</span> Basque: haltz R. L. Trask (2008) “haltza”, in Max W. Wheeler, editor, Etymological...