Idasia appears to be a modern coined name, likely blending Ida with a stylish ending.
Idasia appears to be a modern coined name, likely blending Ida with a stylish ending. That makes it feel like part of the broad contemporary tradition of extending short classics into more elaborate forms.
Idasia sounds graceful and slightly exotic without being difficult to pronounce. The familiar Ida element gives it historical grounding, while the added ending makes it feel fresher and more ornamental. Its effect is soft, feminine, and noticeably modern in spirit.