Vote Distribution:
Umbreon: 67 062 (22.83%)
Sylveon: 66 029 (22.48%)
Eevee: 47 762 (16.26%)
Espeon: 30 052 (10.23%)
Glaceon: 26 161 (8.91%)
Leafeon: 20 859 (7.10%)
Vaporeon: 14 887 (5.07%)
Jolteon: 11 064 (3.77%)
Flareon: <9 900 (<3.37%)
Desu, if anything, in the context of the other votes, sylveon and umbreon are about as popular as one another since the 1k difference with that many votes is very marginal (1.5% difference).
It's crazy how much it dropped off by the time the gen 1 eeveelutions were considered too.