1 Chronicles 20:5

Elhanan … slew Lahmi the brother of Goliath In 2 Samuel 21:19 Elhanan … the Beth-lehemite slew Goliath(R.V.). The difference between the two sentences in Heb. is very small, and the Chronicler, or any copyist, might feel that he was making a certain emendation in substituting the brother of Goliath for Goliath himself, who, according to 1 Samuel 17, was slain by David before he became king. But it is not certain that there is a discrepancy between 2 Samuel 21 and 1 Samuel 17, for Goliathmay be, not a personal name, but a descriptive title of some kind; e.g. "Goliath the Gittite" might mean "the Gittite champion." "Tartan," "Rabsaris" and "Rabshakeh" (2 Kings 18:17) were once taken as proper names, but are now known to be descriptions of Assyrian officers.

whose spear staff) R.V. the staff of whose spear.