6 The first son she bears shall carry on the name of the dead brother so that his name will not be blotted out from Israel.
6 And it shall be, that the firstborn which she beareth shall succeed in the name of his brother which is dead, that his name be not put out of Israel.
6 And the first son whom she bears shall succeed to the name of his dead brother, that his name may not be blotted out of Israel.
6 The first son that she bears shall be named after her dead husband so his name won't die out in Israel.
6 And it shall be that the firstborn son which she bears will succeed to the name of his dead brother, that his name may not be blotted out of Israel.
6 The first son she bears to him will be considered the son of the dead brother, so that his name will not be forgotten in Israel.
Matthew Henry's Commentary on Deuteronomy 25:6
Commentary on Deuteronomy 25:5-12
(Read Deuteronomy 25:5-12)
The custom here regulated seems to have been in the Jewish law in order to keep inheritances distinct; now it is unlawful.