Genesis Genesis 30:1-24
Genesis 30:22 is the canonical pivot of the matriarchal narrative — and-God-remembered-Rachel — and the four-fold formula that follows supplies the Lukan infancy hymns with four independent Greek lemmas. Mary inherits Rachel's vocabulary as closely as she inherits Hannah's.
Genesis 17:15-27
Same theophany, second petuchah. Gen 17:15-27 names what Gen 17:1-14 inscribed. Sarai becomes Sarah; Abraham laughs inwardly at the announcement and the child is named for the laugh; God says aval - truly - and the covenant narrows from Abraham's seed generally to one named son not yet conceived. Ishmael receives the creation-mandate blessing every nation can receive; Isaac receives the berit olam. At Mamre the angel will quote this annunciation back: shall a word be impossible with God? Luke quotes the angel back over Mary. The child's name is the disbelief converted into gift, and the seed-bearer is the woman God blesses by name.