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After doing some digging I found these:

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These suggest that Gerinel is a Caló (Spanish Romani) form of Miguel:
http://espanol.babycenter.com/babyname/7203102/gerinel

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http://es.wikisource.org/wiki/Diccionario_gitano/Vocabulario_cal%C3%B3-castellano

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This suggests that Gerineldo is an alternate of Gerinel:
http://www.tuparada.com/nombres/significado-del-nombre-gerinel/16325

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Here is a synopsis of the ballad of Gerineldo, which apparently has many versions:
http://www.orbilat.com/Languages/Spanish-Ladino/Society_and_Culture/Gerineldo%20.html

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Gerineldo looks like it's a variant form of Gerinaldo. I am pretty sure that Gerinaldo is the Spanish form of what was originally a Germanic name. In that case, the -aldo part of the name is derived from Germanic wald "rule", just like it is with names such as Geraldo and Reinaldo. The first element of the name (the gerin- part) would possibly be derived from Germanic ger "spear", but I am not entirely certain of this. If it is true, however, then Gerinaldo could be considered to be a more elaborate form of Geraldo.