Dillen Is A Masculine Name Meaning "like A Lion" Or "loyal.” It Is A Variation Of The Irish And Gaelic Name Dillon, A Surname That Was Brought Into Ireland In The 12th Century. The Name Dillen Means “faithful” In Breton, Which Is One Of The Only Celtic Languages Still Used In Mainland Europe. It Is A Name That Has An Abundance Of Variations, Including The Name Dylan Of Welsh Origin, Which Means “son Of The Sea.” For Those With A Wild And Wonderful Spirit That Resembles The Ocean, This Name Can Honor Your Little One’s Roots And Remind Them To Stay Loyal And Firm In Their Beliefs.