I'll have to admit that I've never heard this name before! It looks pretty when written though, what's its origin?
I would pronounce it like 'a-LEE-duh' (sorry, can't type that schwa), and I think Aleida Joan or Aleida Emerald sound fine.
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Pronouns: s/he (varying their usage) and they (not my favourite but oh well)
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Allons-y, Alonso!