Isabella descends from the Hebrew Elisheba by way of Spanish and Italian forms, and its traditional meaning is often given as "God is my oath" or "devoted to God." The name has long been associated with gracious, steadfast devotion rather than solemn obligation, carrying a warmth that softened over centuries of use across languages.
When the Moon and lord of the ascendant shall be impedited by the lord of the 8th, the sick person hath cause to fear. - William Lilly (1602.-1681.)