Salim and Salman are not shown as related because they come from a common root word, not from a common name. The database is filled primarily with names, I haven't collected many root words. You can find a few family trees which spring from common roots, eg
http://www.behindthename.com/php/tree.php?name=annunziato. However, I haven't done too many of these yet since that's another huge undertaking. All the elements in dithematic Greek, Germanic and Slavic names could potentially be added. This would show the ultimate relations between Albert and Robert, and even between such diverse names as Vladimir and Arnold.
As for Jo- names relating to Yahweh... there is an etymological connection between the Jo- names and Yahweh, where there is only a semantic connection between the -el names and Yahweh.