Found 2 boys and girls with the meaning of usurper
Engres / 6 letters 
Meaning of Engres In Arthurian Legend, Engres means A usurper More
Frederick / 9 letters 
Meaning of Frederick In Teutonic, Frederick means As You Like It' Brother to Duke, and usurper of his dominions More

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heavenlyheavyhebrew
hebrewshectorheedful
heightheightshelen
helgasonhellohelmet
helmetedhelperhenry
hephaestusherberthercules
herderhereditaryhermes