Hadewych is a Dutch variant of the name Hedwig, which originates from the Old High German name Haduwig, composed of the elements 'hadu' meaning 'battle' and 'wig' meaning 'fight'. The name Hadewijch, a variant of Hadewych, is associated with a 13th-century poet and mystic from the Duchy of Brabant, known for her writings in Middle Dutch, including visions, prose letters, and poetry. Her work significantly influenced later mystics such as John of Ruysbroeck.