בָּר֣וּךְ הַ֭בָּא בְּשֵׁ֣ם יְהוָ֑ה בֵּ֝רַֽכְנוּכֶ֗ם מִבֵּ֥ית יְהוָֽה׃
Błogosławiony kto przychodzi w imię Boże; błogosławimy wam z domu Bożego.
Ibn Ezra
and help you The suffices indicate a second person masculine plural direct object, masculine plural subject (as in “we bless you” [Psalms 118: 26]). But if you assert that He is singular — then let Him come and provide you with refuge against the coming calamities.