Darrin Dualla
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Darrin Dualla was the brother of Anastasia Dualla. He died in the Cylon Holocaust, but a version of him (possibly a Cylon-produced clone) was discovered onboard Medivac 12.
Notes
In the comic, he is only referred to as "Darrin," and in fact calls his sister "Dualla." However, it is only logical to assume that siblings would share the same last name.