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The ODO entry for 'fervent' recommends to:

Compare with fervid and fervour.

I did read Etymonline's entry for 'fever' which doesn't explicitly answer this, but I think that I'd need to know rare linguistic variants to compare the etymologies and 'read between the lines' ?

Footnote: This article on the 'fiery' US TV series 'House of Cards' inspired this question.

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    The OED says that fever comes from a common root for 'fever' in Latin and Germanic; fervor comes from a Latin verb meaning 'boil', and fervid comes from a different Latin verb meaning 'to glow'.
    – John Lawler
    Commented Mar 20, 2015 at 4:18
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    @John: but to boil, to glow, and to be feverous all have in common the notion of being hot, their Latin roots are very similar, and I think it would be very surprising if they didn't all come from the same root in one of the not-too-far-removed ancestors of Latin.
    – Peter Shor
    Commented Mar 20, 2015 at 13:12
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    The AHD says they all come from the PIE root *bhreu-, so your hypothesis is confirmed, @Peter.
    – John Lawler
    Commented Mar 20, 2015 at 14:09
  • @JohnLawler The link you provide doesn't list "fever". According to Wiktionary, we are dealing with two different PIE roots here.
    – user278584
    Commented Mar 9, 2018 at 1:10

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No. According to Wiktionary, "fever" can be traced to the Proto-Indo-European root *dʰegʷʰ-. "Febrile" would be a cognate.

"Fervo(u)r"/"fervid" can be traced to a different Proto-Indo-European root, *bʰrewh-.

And while they have meanings that touch on similar things (being hot), these are two different roots. Thus, there is no shared etymology.

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