Ukrainian голос, Belarusian голас, Old Slavonic гласъ φωνη, Bulgarian гласът, Serbo-Croatian niâc, Slovenian glâs, Czech. hlas, Polish glos, Upper-Sorbian hiös, Lower-Sorbian gîos. || Formation of -so is similar to Lithuanian garsas "sound", Old Indian bhäsä "speech, language", Lithuanian balsas "voice": bilti "to speak|| Middle Ossetian yalas "voice" (Hubschman, Osset. Et. 33), further, Old Icelandic kalia "to shout, to speak", Irish gall (*galno-) "famous", Cymraeg galw "to call, to summon"; see Fortunatov, AfslPh 4, 578; Berneker 1, 323; Trautman, BSW 77; Thorpe 42; Meyer, MSL 14, 373; Persson 852 (according to which, correlation to Latin gallus "rooster"; against see Walde - Hofm. 1, 580 and pp.); Stokes 107. Next, here is нагал "password".
Fasmer was unable not to point out the kinship of the Russian golos and the Latin gallus (rooster). This was above his Germanophilia and Russophobia.
Let's remember this magnificent passage and open the dictionary of Dahl, who wrote that the голосовик (golosovik) is "a bird with a good, loud voice; vocal."