Olm is English

No etymologies that I could find online, but one dictionary suggested it was a borrowing from German. German Ulme, English elm, Latin ulmus (> Spanish alamo, alameda) are cognate with Dutch olm, but I don't think there's a connection between those tree words and the blind slamander word. The Slovenian word, človeška ribica, translates as 'human fish'.

Ceci n'est pas un seing.