So the sense is, When the usual time from the conception to the birth was past, she brought forth her son. Heb. in or after the revolution, or expiration of some days, Hannah conceived, and in due time bare a son. So the meaning is, That although her husband knew her conjugally at his return, and God was minded of her, and intended in his time to give her his blessing, yet she did not conceive at first, but after some days or time afterwards. And called, i.e. she called, not doubting of her husband's consent to the name. The names of children were given to them sometimes by their fathers, and sometime by the mothers. See Genesis 4:1,26 Genesis 5:29 21:3 19:37,38, &c.
Related Commentaries of 1 Samuel 1:20
1 Samuel 1:20
20 Wherefore it came to pass, when the time was come about after Hannah had conceived, that she bare a son, and called his name Samuel, saying, Because I have asked him of the LORD.