As a fellow Daniel, the spelling doesn't deviate much but the diminutives do.
I live in Mexico and it's Dani here and in many Spanish speaking countries. I go by Dan and that form is pretty much never used so it causes a lot of confusion.
The spelling is important so people don't get it wrong when they have to write it down. It can be a bureaucratic nightmare to get this kind of thing fixed sometimes.
For example my birth certificate had a typo in my dad's last name and when I was getting my first ID card I had to go to the notary to get the birth certificate typo fixed before getting the ID card issued. Took half a day of work...
I live in Mexico and it's Dani here and in many Spanish speaking countries. I go by Dan and that form is pretty much never used so it causes a lot of confusion.
Cool post regardless.