Adalger m. Old English æþel, Old High German adal 'noble' + Old English gār, Old High German, Old Saxon gēr 'spear'.
Cf. Adalgaria. Alger can also be a variant of Algar. The German vernacular form Adilger is witnessed between 1074 and 1087 in the place name Adelgerispach (UrkStyr 77) and Adalger is witnessed c1075 in the place name Adalgerispach (UrkStyr 78).