Lonnie \l(on)-nie\ as a boy's name (also used as girl's name Lonnie), is pronounced LAH-nee. It is of Old German origin, and the meaning of Lonnie is "ready for battle". An independent name and short form of Alonzo (Old German) "ready for battle". Sinister film actor Lon Chaney.

Read more at http://www.thinkbabynames.com/meaning/1/Lonnie#SuW0iTM2sdkY7ilq.99