What does Benjamín mean?
The Spanish form of Benjamin, from the Hebrew Binyamin, 'son of the right hand' (ben 'son' + yamin 'right hand', implying the south, or favor and strength). In Genesis he is the youngest son of Jacob and Rachel.
What does Sebastián mean?
The Spanish form of Sebastian, from the Latin Sebastianus 'from the city of Sebaste', whose name derives from the Greek sebastos 'venerable, revered' (the Greek equivalent of the imperial title Augustus). Borne by the early Christian martyr Saint Sebastian.