I like the name [name_m]Calum[/name_m]/Callum with the nickname [name_u]Cal[/name_u]. Which spelling would you use if you didn’t want people to spell it wrong?
Callum! That’s the more typical spelling, at least in the US.
Callum😁
Callum. Nice choice.
Callum is the more common spelling but I think [name_m]Calum[/name_m] looks nicer, so go with what you prefer. It’s common enough that ‘[name_m]Calum[/name_m] with one L’ will be easily understood and remembered
Callum feels more familiar and complete. It seems like that spelling would have the least amount of issues.
[name_u]Callum[/name_u] is very sweet, by the way!
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Callum is one of the few names I prefer with a double letter!
I think [name_m]Calum[/name_m] looks better but [name_u]Callum[/name_u] is more recognisable.
Callum
Callum is the spelling i usually see
I’ve only even seen the [name_u]Callum[/name_u] spelling so [name_m]Calum[/name_m] looks unfamiliar
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I pronounce both differently. I prefer [name_m]Calum[/name_m].
[name_m]Calum[/name_m]- Cah-lum
[name_u]Callum[/name_u]- KAY-lum
Definitely would spell it [name_u]Callum[/name_u]!
Callum 
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[name_u]Callum[/name_u]!
I’d pronounce [name_u]Callum[/name_u] and [name_m]Calum[/name_m] the same way - I’d guess CAL-um for both. I do know a [name_u]Callum[/name_u] who pronounces it “CAUL-um”, like the word “call” at the beginning, but I don’t know whether that’s an accepted pronunciation for [name_m]Calum[/name_m] too.
Well, [name_u]Callum[/name_u]. I like [name_m]Calum[/name_m]…I think that it looks more interesting & it’s more authentic from what I understand. Plus, the nn [name_u]Cal[/name_u] makes more sense w/Calum. But, [name_u]Callum[/name_u] is easier & that’s probably how people will assume that it’s spelled.
Hope this helps. 
I’d spell it [name_u]Callum[/name_u]!
Callum
I’ve never seen [name_m]Calum[/name_m]. The double L adds a nice balance and look to an already wonderful name.