Found these on BehindTheName.com
WALLACE (m) “Welsh” or “foreigner” (French). Sir William Wallace was the Scottish hero who briefly expelled the rule of England from Scotland in the 13th century.
WALTER (m) “rule people” or “rule army” (Teutonic). Composed of the elements wald “rule” combined with either heri “army” or harja “people”. Sir Walter Scott was an novelist from Scotland, the author of ‘Ivanhoe’.
WALLY (m,f) Short form of WALTER or WALLACE (masculine), or VALESKA (feminine).
LINDA (f) “beautiful” (Spanish) or short form of BELINDA or MELINDA. It can also mean “snake” or “serpent” from Teutonic linde. The serpent signified wisdom in Teutonic legend.
ANGELA (f) “messenger” from the Greek word angelos.
I especially like the contrast between Wallace (who felt like an outcast in his own family) and Walter (who is the more ruthless of the two). “Linda” representing wisdom fits with what Wally said about her teaching him everything he knows about being an adult. Angela as a messenger, though… that’s an interesting idea.