SECU (sē'kū, Heb. sēkhû). A village near Samuel’s town of Ramah (1Sam.19.22), probably in the direction of Gibeah (1Sam.19.9). The name is spelled Sechu in KJV.
SECU sē’ ku (שֶׂ֔כוּ, lookout point). KJV SECHU. A place between Gibeah and Ramah visited by Saul in seeking information to search out David and Samuel (1 Sam 19:22). There is a possible identification with Khirbet Shuweikeh (cf. Conder, Survey of Western Palestine, 52), three m. N of Ramah. Lagarde’s LXX and B read ἔν τῳ̂ζέφει, “on the bare hill-top,” attesting a possible Heb. original of שְׁפִי, H9155, “bare hill.” This textual variant is easily possible in Heb. cursive or square Aram. script. The Peshitta reads “the end.” Other Gr. MSS and Vul. support the MT. A cistern at the site would be a well-known gathering place where information could be secured.
International Standard Bible Encyclopedia (1915)
This name occurs only in the account of David’s visit to Samuel (1Sa 19:22). Saul, we are told, went to "Ramah, and came to the great well that is in Secu," where he inquired after Samuel and David. It evidently lay between the residence of Saul at Gibeah and Ramah. It is impossible to come to any sure conclusion regarding it. Conder suggested its identification with Khirbet Suweikeh, which lies to the South of Bireh. This is possible, but perhaps we should read with the Septuagint’s Codex Vaticanus, "He came to the cistern of the threshing-floor that is on the bare hill" (en to Sephei). The threshing-floors in the East are naturally on high exposed ground where this is possible, and often form part of the area whence water in the rainy season is conducted to cisterns. This might have been a place actually within the city of Ramah.