No there are not in fact "many, many, more" and you can't name them accordingly. There are exceptionally few, massive, successful conglomerates. So few that there are only a handful of them in the entire $19 trillion US economy.
In the entirety of all global business today, there are only a few dozen conglomerates large enough to make either the US or global equivalent of the Fortune 500 in terms of sales.
The majority of those conglomerates exist not due to a special process or skill, instead they exist due to vast amounts of time and wannabe empire building managements (eg General Electric).
GM was a classic example of that wannabe empire building. They tried to build a conglomerate and it went poorly. They acquired companies like Hughes and EDS.
More often you get outcomes like GE's empire building which nearly bankrupted the company and required a bailout to keep them from collapse. Sony is another classic example of a failed attempt at a conglomerate empire.