וְאֵ֤ל שַׁדַּי֙ יְבָרֵ֣ךְ אֹֽתְךָ֔ וְיַפְרְךָ֖ וְיַרְבֶּ֑ךָ וְהָיִ֖יתָ לִקְהַ֥ל עַמִּֽים׃
Der allmächtige Gott segne dich, mache dich fruchtbar und mehre dich, dass du zu einer Menge von Völkern werdest,
Rashi on Genesis
ואל שדי AND GOD ALMIGHTY —He who has a sufficiency of blessings שָׁדִּי for those who are blessed by Him, יברך אתך MAY HE BLESS THEE.
Siftei Chakhamim
He who has sufficient blessings... Otherwise, why is this particular Name of Hashem mentioned here?