Euphranor

A variant of this name is Euphrenor, which is written as Εὐφρήνωρ in ancient Greek:

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• http://clas-lgpn2.classics.ox.ac.uk/cgi-bin/lgpn_search.cgi?namenoaccents=%CE%95%CF%85%CF%86%CF%81%CE%B7%CE%BD%CF%89%CF%81 (in English; features 6 results)
• https://glg.csic.es/NombresGriegosDePersona/ListasNombres/NombresDePersona_E.html (in Spanish)

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To me, this strongly indicates that Euphranor is actually a dithematic name, with the Greek noun ἀνήρ (aner) meaning "man" as the second element. After all, this word usually becomes -άνωρ (-anor) and -ήνωρ (-enor) when it is the second element in both words and given names. You can see this very well here:

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• List of terms derived from ἀνήρ (aner): https://en.wiktionary.org/wiki/%E1%BC%80%CE%BD%CE%AE%CF%81#Derived_terms (in English; click on "show more")
• Meaning of words ending in -νωρ (-nor): http://www.perseus.tufts.edu/hopper/resolveform?type=end&lookup=nwr&lang=greek (in English; select 'Latin transliteration' at "Greek Display" in the display preferences)
• Ancient Greek names ending in -νωρ (-nor): https://www.behindthename.com/submit/names/usage/ancient-greek/pattern/*nor (in English)
• Names from Greek mythology that end in -νωρ (-nor): https://www.behindthename.com/submit/names/usage/greek-mythology/pattern/*nor (in English) and also https://www.behindthename.com/namesakes/list/greek-myth/name/*nor/alpha (in English)

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Some (but not all!) of those names also have an equivalent that ends in -ἀνδρός (-andros), which makes the connection to ἀνήρ (aner) even clearer, since ἀνδρός (andros) is its genitive. Examples of this are: Alexandros & Alexanor, Antandros & Antenor, Euandros & Euenor, Nikandros & Nikanor and Philandros & Philanor. It appears that Euphranor does not have this type of equivalent, because I was unable to find any records of Euphrandros. If that name did in fact exist once upon a time, then all evidence of its existence must have been lost to history.

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Finally, I should note that at this time, the existence of Εὐφρήνωρ (Euphrenor) and the consistent pattern of ἀνήρ (aner) in both words and given names are the only things that seem to point to Euphranor being a compound name. All of the available sources about the name Euphranor make no mention of ἀνήρ (aner) whatsoever, although of course that does not necessarily mean that all of those sources are 100% correct or complete. Examples of such sources are:

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• https://www.trismegistos.org/nam/detail.php?record=3086 (in English)
• the entry for Euphranor at Pavlos' Etymologica: http://web.archive.org/web/20120325073930/http://www.etymologica.com/page8.htm (in English)