What does Rosalind mean?
Disputed etymology. Originally Germanic, from 'hros' (horse) + 'lind' (soft, tender), i.e. roughly 'gentle horse'. In Romance-speaking areas it was reinterpreted by folk etymology as Latin/Spanish 'rosa linda' meaning 'beautiful rose'. The floral meaning is the popular later reading, not the original.
What does Hildegard mean?
From Germanic 'hild' (battle) and 'gard' (enclosure, protection), roughly 'protector in battle'. Borne by the 12th-century abbess and polymath Hildegard of Bingen.