What does Gertrude mean?
From Germanic 'ger' (spear) and 'thrud' (strength), so 'strong spear'. The 'spear' element is a weapon of war rather than 'warrior' outright, but the martial sense is well established.
What does Emery mean?
From the Germanic Emmerich — amal (work) and ric (power) — “brave, powerful ruler.”