Found 2 boys and girls with the meaning of expert
Moriarty / 8 letters 
Meaning of Moriarty In Irish, Moriarty means Expert seaman More
Muircheartaigh / 14 letters 
Meaning of Muircheartaigh In Irish, Muircheartaigh means Expert seaman More

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thiefthingthink
thinkersthirdthirty-nine
thomasthor'sthorgest
thorleifthorleikthorn
thosethoughthought
threethreshingthrone
throughthroughoutthunder