What does Genesis 48:16 mean?

the God who’s watched over me like a shepherd since I was born—may he bless these boys. May they carry on my name and the names of Abraham and Isaac. May they grow into a great crowd of people on this earth.' Genesis 48:16 - Modern Text Bible

(Jacob asks God to protect and prosper Joseph’s sons, connecting them to the family’s legacy and praying for their future growth.)