The more common form of this name in Ukraine is Semen (Семен, Se-mEn). Famous bearers are Semen Hulak-Artemovsky or Semen Paliy. Symon (Симон, SI-mon) is rather rare form, mostly ecclesiastical or biblical (Симон Зілот - Simon the Zealot, Симон Маккавей - Simon Maccabeus). [noted -ed]
In modern Dutch, Symon is pronounced as: /'si.mɔn/
Sources:
• https://dmnes.org/name/Simon (in English; see Belgium, Brabant and The Netherlands)
• https://nvb.meertens.knaw.nl/naam/is/Symon (in Dutch; shows the prevalence of the name in the Netherlands in 2017)
• http://www.names.be/voornamen.html?met=Symon&sort=beldesc (in Dutch; shows the prevalence of the name in Belgium in 2009)
• Dutch Names 1358-1361: https://www.ellipsis.cx/~liana/names/dutch/earlydutch14.html (in English)
• Names from Antwerp, 1443-1561: https://www.ellipsis.cx/~liana/names/dutch/plaiser.html (in English)
• Symons (patronymic surname): https://cbgfamilienamen.nl/nfb/detail_naam.php?gba_lcnaam=symons&gba_naam=Symons&nfd_naam=Sijmons%20(y)&operator=eq&taal= (in Dutch)
• (general): https://www.linkedin.com/pub/dir/?first=Symon&last=&search=Zoeken
• https://www.facebook.com/search/people?q=symon
• Symon van de Moolen (1658-1741): https://nl.wikipedia.org/wiki/Symon_van_de_Moolen (in Dutch)
• Symon van der Does (1507-1587): https://nl.wikipedia.org/wiki/Symon_van_der_Does (in Dutch)