How to stop the ridiculous name

So we have been discussing names in 19 days we find out if it's a girl or a boy were having we have the girls name covered but for a boy he likes Lucifer how on earth do I stray him away from this 😂 I've tried coming up with similar names that aren't related to the devil and I'm not religious I just don't think it's appropriate for a baby 😂 he's dead set on this name choice and I have expressed that I'm not but he won't bloody budge 😣 any tips you used to sway your other half in another name direction 😂