According to Genealogy Library: Name Abbreviations at www.ask.com The abbreviations are as follows: Jonathan Jonathn, Jonn, Jon: John Jno: Jno This is the website: http://www.ask.com/main/metaanswer.asp?metaEngine=directhit&origin=0& MetaURL=http%3A%2F%2Fask%2Edirecthit%2Ecom%2Ffcgi%2Dbin%2FRedirURL%2Efcg%3Furl %3Dhttp%3A%2F%2Fpcm%2Epcmedia%2Ecom%2Eau%2Ftags%2Fdocs%2Fnameabrv%2Ehtml%26qry %3DWhat%2Bdoes%2Bthe%2Bname%2BJno%2Bstand%2Bfor%253F%26rnk%3D6%26src%3DDH%5FAs k%5FSRCH&qCategory=ref_&metaTopic=Genealogy+Library%3A+Name+Abbreviations& ItemOrdinal=5&logQID=D1CE47BB56B6A346854619F4B7E4F281&sv=18& back=http%3A%2F%2Fwww%2Eask%2Ecom%2Fmain%2FmoreResults%2Easp%3Fask%3DWhat%2Bdo es%2Bthe%2Bname%2BJno%2Bstand%2Bfor%253F%26origin%3D0%26qsource%3D5%26qcategor y%3Dref%5F%26logid%3DD1CE47BB56B6A346854619F4B7E4F281%26sv%3D18