There is no single "correct" answer, as the name should evoke the desired image and feeling. Here are several options, categorized by approach, for a country name representing a unified Palestine and Israel:

Emphasizing Unity and Shared Heritage:

• Canaan: A historical name for the region, signifying a return to ancient roots and shared origins.
• Shalom Land: A direct and hopeful name combining Hebrew and Arabic words for peace.
• Eretz-Filastin: A combination of Hebrew (Eretz - Land) and Arabic (Filastin - Palestine), representing both cultures.
• United Levant: A geographically descriptive name, referencing the historical region.
• Land of Abraham: Referencing the patriarch common to Judaism, Christianity, and Islam.

Emphasizing a New Beginning:

• New Canaan: Suggests a fresh start while retaining a historical connection.
• Amana: (Arabic for "trust" or "faith") A hopeful and positive name suggesting a future built on trust.
• Covenant Land: Referencing the importance of agreements and shared commitments.
• The Bridge: Symbolic of connection and bridging divides.
• Renaissance Land: Suggests a rebirth and flourishing of the region.

More Abstract/Poetic Names:

• Auroras: Evokes a sense of light and hope.
• Cedars of Peace: Referencing the cedar tree, a symbol of strength and resilience in the region.
• The Olive Branch: A symbol of peace and reconciliation.
• The Two Rivers: Referencing the Jordan and other significant rivers in the region.
• Mount Zion: A significant religious and historical location.

The best choice will depend on the specific context and desired message. Consider which aspects of the union you want to highlight (peace, shared history, new beginnings, etc.) when making your selection.