Here are a few possibilities, prioritizing different aspects:
* Sydney: This could be spelled "Sidney" (most common and closest pronunciation), or "Sydni" (less common, but reflects the 'y' sound more directly).
* Henegar: This is the trickiest part. There's no perfect equivalent. You might choose something that sounds somewhat similar, but it will inevitably be an approximation. Options could include "Heneger", "Henegger", or even "Henigar".
Therefore, some options for the full name could be:
* Sidney Heneger (Probably the most straightforward and common approach)
* Sidney Henegger (Slightly closer to the 'ar' sound)
* Sydni Heneger
* Sydni Henigar
Ultimately, the best choice depends on context and personal preference. There's no single "right" answer.