Failed to execute 'createElement' on 'Document': The tag name provided ('static/media/icon.ac7a4370.svg') is not a valid name.

react-svg-loaderを使い表題のエラーが出た場合はwebpack.configに以下の設定を追加してください

config.resolve.extensions.push('.svg')
config.module.rules = config.module.rules.map(data => {
  if (/svg\|/.test( String(data.test)))
    data.test = /\.(ico|jpg|jpeg|png|gif|eot|otf|webp|ttf|woff|woff2|cur|ani)(\?.*)?$/
  return data
})
config.module.rules.push({
  test: /\.svg$/,
  use: [
    { loader: require.resolve('babel-loader') },
    { loader: require.resolve('react-svg-loader') }
  ]
})