Your first name of Isac has given you a quick, analytical mind. Although you are not demonstrative of your feelings in family relationships, you maintain a strong sense of loyalty. In your dealings with people you place great importance in living up to one's word. Any criticism from others causes you to retaliate cuttingly in self-defense. You are happy and in good spirits as long as headway is being made, but as soon as you feel obstructed or your individuality and freedom of action are curtailed, you experience an intense nervous reaction in your solar plexus. Once you have given your word and undertaken a commitment, you are completely steadfast in following through in spite of any regret or frustration you may later experience in doing so. This name creates a desire to be a leader, to pioneer new undertakings, and to try new ideas in practical, creative endeavours that provide an outlet for your versatility and imagination. At the best of times, you are not naturally disposed to be companionable and sociable, as diplomacy and finding the right words for the situation do not come easily to you. The effect of the nervous tension can appear in childhood as stuttering. Ailments could also centre in the head causing headaches, sinus problems, or defective eyesight, hearing, or teeth.