Found 4 boys and girls with the meaning of formidable
Egan / 4 letters 
Meaning of Egan In Celtic, Egan means Ardent More
Egon / 4 letters 
Meaning of Egon In Irish, Egon means Fiery More
Emims / 5 letters 
Meaning of Emims In Biblical, Emims means Fears; terrors; formidable; people More
Emims / 5 letters 
Meaning of Emims In Biblical, Emims means Fears; terrors; formidable; people More

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and/orandesandirish
andreandreaandrew
andrewsandronicusangel
angelaangelicangelicus
angerangharadanglicized
anglo-saxonanguishanjou
ankaraann'sannesley