The exact meaning of this word is not entirely clear, as it appears to be a corrupted or transformed form of an older term. In Sanskrit, Siri (Shri) means Lakshmi or prosperity, wealth. In earlier times, it was customary to prefix the word Shri before a king’s name as a mark of respect and auspiciousness. The term Shri was used to convey a sense of well-being or benevolence. It is believed that Sira or Siri might be a distorted form of Shri.
Hence, it is likely that the gotra name was prefixed with Shri (later becoming Sira/Siri) to symbolize auspiciousness or well-being. The words Sira, Siri, and Shira can also mean excellent, beautiful, graceful, or charming. However, the most plausible interpretation in this context is that the word was used in the sense of auspicious or benevolent, signifying a wish for well-being associated with the gotra name.