Chinese / Mormon can fruit alone, but it still benefits from a partner. Many apricots can fruit alone, but another apricot often improves the crop. It flowers in mid bloom, which is worth knowing if you add a second tree later. Usually grown in USDA zones 5-8.
No single variety stands out as the obvious partner, but that is not a problem here: Goldcot, Harcot, Hargrand, Moorpark, and Perfection all bloom close enough to work. There are 4 more in the list below. Pick whichever your nursery actually carries. Keep apricot partners close enough for bees to move easily between them. Apricots flower early, so reliable overlap matters in cool springs.
One thing to keep in mind. This plant-page label covers closely related nursery naming. A second apricot is still the safer choice when you want better fruit set.
To put that into practice: at a minimum, one self-fruitful apricot can work, but two apricots are safer if you want steadier crops. Better still, plant two apricot cultivars with overlapping bloom so you get better fruit set and a backup if one tree blooms weakly. If you already have a partner-dependent apricot, add a second apricot cultivar instead of waiting for self-pollination that may never come.