Considering the existing names Sora, Clementine, and Azarius, and aiming for a boy's name to complement them, while keeping in mind the surname Hickson, several options emerge depending on the desired style:

Options emphasizing a similar sound/feel to existing names:

• Classic & Elegant: Names like Caspian, Julian, Silas, or Felix offer a similar sophisticated feel to Clementine, while not being overly similar phonetically. They pair well with Hickson, creating a refined overall sound.

• Slightly more modern/unique: Names like Arlo, Rhys, Jasper, or Orion share a slightly less common but still appealing quality with Azarius and Sora. These names offer a balance between unique and familiar.

• Nature-inspired (to complement Sora): Forest, River, Brooks, or Asher evoke a similar natural imagery as Sora, creating a cohesive theme. These names work well with Hickson, offering a slightly rustic yet sophisticated feel.

Options contrasting with existing names (for a more diverse sibling set):

• Strong & Traditional: Names like William, Henry, Arthur, or Theodore provide a strong contrast to the more delicate-sounding Clementine, while still pairing well with the surname Hickson. These names offer a classic and robust feel.

• Short & Sweet: Names like Leo, Finn, Owen, or Max offer a simple and memorable contrast to the longer names already chosen. These names are easy to pronounce and remember, creating a nice balance within the sibling set.

Considering the surname Hickson:

The surname Hickson is relatively strong and has two syllables. Names that are either one or two syllables will generally pair well. Avoid names that are overly long or have a similar sound to Hickson to prevent the names from sounding clunky together.

Final Recommendations (with rationale):

• Julian Hickson: Offers a classic elegance that complements Clementine, while being distinct from Sora and Azarius.
• Arlo Hickson: Provides a modern yet sophisticated feel, offering a nice contrast to the existing names.
• River Hickson: Creates a nature-inspired theme, linking well with Sora, while remaining distinct from the other names.
• William Hickson: Offers a strong and traditional contrast, balancing the more unique names already chosen.

Ultimately, the best choice depends on personal preference. Consider saying the full name (first and last) aloud to get a feel for how it sounds.