Looking for origins on these two names. Araica is my friends Costa Rican last name and Alzate is my Colombian last name. Any clues to origins would be appreciated.

I couldn't find Araica. But if you go to
Alzate Name Meaning and Origin (http://www.ancestry.com/facts/Alzate-name-meanin.ashx)
You can find Alzate. Hope this helps! Could Araica possibly be a form of Erica?