No it wasn't.
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False - it was a spin-off from Happy Days
Scott Baio played Chachi on Happy Days and in the spin-off series Jonnie Loves Chachi.
Love, American Style
As far as I can find, The Guinness Book of Records (as of September 2013) states the Japanese show, Ultraman has the most spinoffs at 27.(sgcafe.com/2013/09/ultraman-wins-guinness-world-record-tv-series-number-spin-offs)
Garry Marshall, Lowell Ganz, and Mark Rothman