The Republic F-105 Thunderchief was a Korean War- and Vietnam War-era supersonic fighter-bomber built by the same company that made the P-47 Thunderbolt during World War II, and had four production variants; the F-105B (initial production version), F-105D (all-weather version with improved avionics; more than 600 airframes produced), F-105F (two-seater trainer; some were converted to SEAD/Wild Weasel capability), and the F-105G "Wild Weasel" SEAD variant, which was a further improvement on the so-called SEAD F-105Fs, with improved countermeasures and (according to some sources, but not all) an improved Navigational Radar, the AN/APN-192.
The reason you've probably never heard of it is that, while yes, it was, on its own, an impressive aircraft (it's credited just under 30 MiG kills, one of which is said to have been when an F-105D pilot ejected his fully-loaded centerline bombrack into the path of an incoming enemy MiG; and there's also the fact that two F-105F/G Wild Weasel pilots earned the Medal of Honor), it suffered relatively high losses for the number of airframes built compared to the Air Force's F-4C/D/E/G (F was an export variant for Germany; G is the iconic F-4 Wild Weasel variant), which is why far more people have heard of it.
An interesting thing worth noting is that, unlike most aircraft of its time (and indeed, even most aircraft now; the sole exception being stealth aircraft and dedicated bombers), the F-105 had an interior bomb bay. Additionally, it was nuclear-capable even at supersonic speeds, thanks to the B61 and B57 bombs ( ), although it could carry others as well. (Those are so-called "streamlined" bombs; designed to be dropped at high speed.)
It had a couple of nicknames, although I think the most popular one by far is "Thud."