Nandino may mean "little Nando" Nando is a short form of the first name Fernando + the diminutive suffix -ino.
Ricon may derived from the Spanish word 'ricon' meaning "little space", perhaps a "dweller in a small space, someone with a small amount of land".
Rini is a little harder to find out about, possibly Italian, again possibly a short form of names ending in -rini. ??? Sorry.
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