The Tooltip component has a className property. Providing a class name there does not seem to apply the class to the DOM element. See my below code and attached screenshot ...
<div className="col">
<label className="d-block">Name</label>
<Input value={name} required={true} onChange={handleNameChange} />
<Tooltip className="d-inline">
<i className="k-icon k-i-info" title="The name of the Taxonomy" />
</Tooltip>
</div>